I got this KB for 6 months now it's good, i love it, but it's way too fragile. Damn Cat spilled a little bit of coffee on the keyboard (above the numpad), of course it hit right where the cord enters the keyboard (because Logitech can't put their cord in the middle like everyone) and it just plain died. A 200$ kb that can't take a little spill. I've contacted support to get a RMA (you never know) and i found it for half price for boxing day at newegg. In any case, unless you're dumb like me, go for the corsair or, maybe, the kingston one.
Funny enough, I own a Logitech G15 (typing on it right now at work) and a Corsair mechanical keyboard. I love the Corsair so much more for cleaning since the key aren't inset into the frame so the amount of shit/dust that builds up under the keys is so much less (because it can come out easier).
Well Logitech just emailed me to tell me they send me a new one. It's great customer service as i haven't sent mine back. Now i have 2 as i purchased one on newegg when it was on sale. Well i have 2 comps anyway.