The Das keyboard has got alotta hate on geekhack. I recently purchased mine and I have no problems with it, only with the fact that it only works via. USB 1.1 and not directly USB 2.0 in which you need a USB Y cable adapter which they should provide you with one. I however did not get one with my order but am waiting for DAS to send me 1. In the mean time, i'm just connecting it via a 1.1 USB hub which enables it to work fine. YAY. I type at around 85-90wpm and sometimes peak at 100+ and i absolutely cannot feel the rollover problems and typos that people have been complaining about. I assume that if you type at an average of 120wpm, then maybe you'll be experiencing the typos quite frequently. Although when you type asdf together, you would get the exact same pattern over and over, its really not that bad of a problem although would be something nice for them to fix. Some people were complaining about the "teh" problem. I tried to type "the" as fast as i could and I could never get "teh". If you type "teh", i'm almost 98% sure that you're actually typing "teh" most of the time haha. The build quality of the DAS isn't all THAT great though, but definately looks shiny. Typing on ti feels like a breeze though definately.
Backlighting in my opinion seems like a waste because i was just never a fan of it I guess. Typing is typing when it comes down to it, and theres no point in wasting time and staring at your keyboard for oddly long periods of time.
In terms of build quality and n-key rollover, FILCO doesn't contain any of those problems and has a very high build quality to it. If you're gonna be doing more typing than gaming, then I would suggest getting FILCO blue cherry if you can. They just feel better typing on for longer periods of time. If your'e gonna be doing mostly mouse work, gaming, occasional typing, the brown FILCO's are probably gonna be more suitable for you.
Hope that helps.
