Summary: This keyboard has been great for me. I don't mind the lack of click that comes with Cherry MX's to alert you that a key has been pressed. I use the keyboard for both writing related to my academic pursuits and gaming as related to telling n00bs off and rapidly typing 'power overwhelming' when I try to play starcraft.
Summary: This isn't a keyboard for someone looking to get a cheap one just to work. This one is geared toward MMO gamers, but it is also very useful if you program, write code, or just need macros. I used this to play all genres of games, and it does a great job. I actually replaced my gaming PC with the K70 because this keyboard was so long that it didn't sit on my lap desk without hanging off the side.
Summary: I bought this as soon as it came out, and loved it. My only quibbles were that the game keys and function keys (F1-F12) were membrane instead of mechanical. Fast forward a while, and the K95 comes out with all mechanical keys. Naturally, I bought one. It is what the K90 should have been. If you are about to buy this now: don't. Get the K95 instead. The extra few bucks is well spent. However, it is still a great keyboard.
Summary: I bought two of these keyboards, one for myself and one for my girlfriend. Mine has been perfect for several months now. My girlfriends had an issue where after a short period of use the backlight would flicker and the keyboard would stop working. I tried everything to fix it, drivers, firmware, different usb ports, different computer etc. The only time it worked without issue was when it was plugged into a computer with a second K90 also plugged in.
Summary: Because keyboard switch types are completely up to personal preference, I cannot say this keyboard is for everybody, but for those who like Cherry MX reds, this board is AWESOME. I myself had never tried a MX red board before I purchased this one, but I must say I have become a fan. Moving on from the switches, the adjustable blue LED's, aluminum body, and raised keys give the board a very sleek, modern aesthetic while sacrificing nothing in terms of performance.
Summary: I have gone through my share of keyboards and the K90 is by far the best. The letters and numbers on the keyboard will never wear out. One dislike I had about the keyboard is not being able to change the blue color, there are three levels of light including the light off making 4 light options. I would have loved to change the blue color to something more my favorite color.
Summary: Of all the gaming peripherals, keyboards have to work hardest to convince you that all those backlit keys and brushed steel signify a tangible and worthwhile step up from the basic beige model. Okay, it's always going to be tangible by definition, but compared to a low-friction, high-dpi mouse, the advantages of a keyboard like the Corsair Vengeance K90 are less evident.
Summary: This is the highest quality keyboard I have had the pleasure to use since I have been around computers, and I started in the mid-80s with a commodore 64 (and Apples at school). Fantastic key motion, tons of extra programmable keys, cool adjustable backlighting, stable foldable support legs, a removable built in wrist rest that is the perfect angle, quality metal casing and easy cleaning access around the keys (they sit above the metal case with room for a brush to run...