Bought this mouse primarily because I wanted to have a couple extra buttons available when playing computer games. I did my research, settled on the G400s and have been happy with it for 9 months running now. While it is marketed as an FPS gaming mouse, this is an easy recommend for anyone based on excellent ergonomics, customization and durability in particular.Pros:Durability - Buttons rated at 20 million clicks. At my present rate of use this mouse would last another 50+ years. There are no signs of mechanical wear whatsoever. The only hint that the mouse is used at this point is a slight bit of abrasion on the pearl-colored "G" logo on the mouse.Ergonomics - Deep thumb groove means mouse is secure in hand and easy to pick up. Fits natural curve of hand with good button placement and feel.Sensor Accuracy- one of the most accurate sensors on the market. This likely won't matter to you unless you happen to be a fairly hardcore gamer but is a nice bonus for any user.Software- The mouse is plug and play and the forward/backward buttons are usable out of the box, but the buttons near the scroll wheel need the Logitech software to be mapped. The Logitech software is slick, light, powerful and quick to install and use. Be it a game or Microsoft Excel, there is no reason productivity doesn't go up relative to a standard mouse.On the Fence:Styling- This is a souped-up premium office mouse with gaming innards and a new paint job. The styling will be hit or miss with most. The office types won't like the gaming paint job and the gamers won't like the fact there are no flashy LEDs. To both I say, "function over form."Cost- You can get all the office functions of this mouse for $30 if you need the buttons but not the "Zero Delta" sensor or 1000hz polling rate etc. As a gaming mouse, it is well-priced compared to its main competition.Textures- The mouse comes with "hydrophobic surfaces" which are durable and resist sweaty palms. They work as advertised and are very durable but many people don't care for the "all plastic" feel of the mouse. The mouse works and it works well. If you need a rubber or satin feel to your mouse, seek therapy immediately and spring for a different (likely inferior) mouse in the meantime.Cons:Lack of braided cord- this could/should be standard these days. Braided is better for looks, sounds (nobody wants a mouse cord that goes fwap fwap all day) and generally staying out of the way.Scroll Wheel- No issues personally, but the profile is admittedly low, it is simply a smooth rubber wheel with a little bit of cheap wiggle and it appears identical to what is on Logitech's $5-10 mice. For a $50 product, it seems rather out of place. That said, it works and this is a rather nit-picky con some wouldn't even notice were it not for the gripes of others.In summary: impressed overall, particularly with the durability aspect of this mouse. 9 months in and I am beginning to believe it will outlast the USB port concept...So, I am a relative newbie to the quality computer mice industry. I have owned a couple of "gems" over the past year or so including a gearhead wireless mouse from Wal-Mart. It worked great for about 2-3 months, but being a wireless mouse, I noticed that the tracking and sensitivity began to suffer. Being that I am a fan of World of Tanks MMO, I couldn't settle for such a lack of performance, so I jumped on my trusty old website friend, Amazon.com, to see what I could find. I would like to mention that I carried an Amazon Prime Membership for about a year in college, so I am a huge fan of the internet mogul and what they represent. This was all after trying an E-3lue Mazer Type-R from NuEgg.com as well that, quite simply, failed before I even pulled it out of the box.So, I jumped on Amazon.com and punched in computer mice to find more than 700,000 hits pahah, and after a quick narrowing of search results to reveal only Logitech devices, I was left with roughly 100 mice to consider. Now, I planned on spending roughly $40-$50 on a mouse with the hope that I'd finding something that'd last, and I am confident that the G400s I found, purchased, and have used for about 2 weeks now is just what I was looking for. The packaging alone screams quality and high attention to detail; however, with marketing expertise/business background, I know that with such a striking package display comes a significant cost as well. So, I'm not sure such was necessary and this could have saved me some money in the end.Flamboyant packaging aside, the mouse itself is what's important here. I bought it with 3 key features in mind:4000 DPI Delta Zero Optical Sensor, Long-life buttons rated to 20 million clicks, 8 programmable buttons. From what I can ascertain after just 2 weeks of use, is that Logitech delivered on their product and then some. The mouse is comfortable (like a glove), the tracking and DPI range is flawless (like a GEM), and the programmable buttons (and easily accessible software) are a great balance for the average person. Trust me when I say downloading the software from the website and configuring buttons, sensitivity settings, macros, polling rate and multiple profiles is simple, and efficient. (I set mine up with 3 differing user profiles in just 10 minutes).So, what is the overwhelming takeaway from it all? For under $50, I was able to acquire a mouse that's COMFORTABLE, CUSTOMIZABLE, and built to STRICT QUALITY STANDARDS. Time will tell if the buttons hold up to a behemoth size 20 million clicks, but first impressions speak volumes with people, and I am confident this mouse from Logitech will deliver on its promises!!Logitech G400s Optical Gaming MouseP.S. It seems like this model may be a bit "dated" or past maturity in its "product life cycle", but I would strongly urge you to consider buying this for just that reason as you will get it for a great price as seemingly "newer" models with minimal improvements will phase this mouse out of the market. I.E. ~ GET IT WHILE IT'S HOT, BEFORE IT'S GONE!!!I own 2 of these mice already - one is 4 yrs old the other is a few months old I bought off ebay. It was labeled new but was clearly a refurbed item based on foreign particles in the grooves and scratches on the underside but otherwise a twin of my original. I kept it after I cleaned it since it functioned and was significantly cheaper in price. This one is is...odd. Different in subtle ways. It was packaged as if new that is for sure but I am thinking it it is a refurb from the manufacturer. The first thing I noticed was the bottom section of the mouse is not smooth plastic but that soft latex kind. The top area where the USB cord starts was not flush like my original. The 2 tabs are noticeably raised much like the one side of my true refurb. There is also light scratches on the flat surface underneath. Normally I wouldn't mind, but it was labeled as new and I paid the price of a new one. It does function and I need the mouse for my 3rd rig and too many mice cramp my hand as this one is longer and conforms to my unladylike larger than normal hands. (A feature of mine I hate but since my husband's hands are freakishly HUGE we are obviously a perfect match going on 22 yrs together.) Anyhow, that is my only gripe that I seemed to have paid full price for what appears to be a (possibly manufacturer) refurb. Maybe it is a later version of the same mouse, but highly unlikely. Ignore the dust and specks - my camera picks up every detail for better or worse.I had an MX518 before this, a mouse that lasted me for ages. I was concerned that after using it for so long it would take ages to get used to a new one. However, the g400s is almost exactly the same. It's slightly lighter in weight, which you notice mostly when moving it, but it tracks superbly, with all mouse buttons responsive and quick. A superb replacement so, and good value for money, especially if it lasts even half the time my old mouse lasted for.Excellent wired mouse. Fits the hand nicely, forward/back buttons on the side, DPI change buttons above and below the scroll wheel. All of the of the buttons are configurable, as are the DPI settings, via Logitech's software ("Gaming Software", they call it).The software is very usable and lean (unlike SetPoint for their non-gaming accessories—that software is a flaming pile of ... um... you get the picture). It has a bunch of presets for various games, including pre-configured commands that are unused but can be assigned to buttons.The DPI buttons are really in FPS games, where you might want a higher DPI for precision aiming, as well as MOBAs (and I guess RTSes) to switch between sweeping mouse movements and more intricately aimed manoeuvres. I usually only set up 2 DPI levels for games.The silicon pads on the bottom seem to pick up a lot of dust at its edges. I get to pick out many dust bunnies out of those every week or so.Awesome mouse, got to say for the price.Its been 2 days and already loving it. The design doesn't shout for attention like it does in the image, its very subtle. You need to download the Logitech's gaming software to assign custom keys to preferred games or application. Very simple to install and follow on screen instructions, and this mouse itself is plug-&-play.Amazon delivered on time, the only thing is the outer packet of this product was really dusty and dirty - like really dusty as if it were seating in a warehouse for like an year or something, I wish they had cleaned it before packing. But the inside as it should be.I've been using the G series of mice for years. Bought this as a "work" mouse at the office. It's lighter then the G5 (now known as G500), but has all the buttons and excellent tracking I'd want.The one regret is it doesn't have the movement speed adjustment buttons on the mouse (seen on the G5 and G500). It's helpful when sniping, or controling paintbrushes in various image software tools.And, lets face it, it looks awesome.I had this mouse for over 5 years. When it finally started dying on me and I needed a replacement I was sad to find that it was discontinued. If you're ever able to get your hands on these for a reasonable price, they are very light and durable.