Hi, I just got the K70 Lux RGB with brown switches a few days ago - you can find it on Amazon, but I do not recommend it.
I am pretty disappointed with the K70. I did a ton of research before buying, and really want to like the keyboard but it is terrible.
Build quality seems solid for the base and all the letter and numerical keys, but my space bar rattles like hell. It feels really loose and cheap. The backspace key also makes a loud rattling sound.
The other keys feel great when typing, and are pretty quiet, but the constant rattle on the space is no good.
I was willing to look past the rattling, but what is even worse is that the software simply does not work. Every time my PC loads up the software it crashes and the RGB lighting freezes or simple goes all red.
I spent several hours researching the problem, installing, uninstalling, repairing, but nothing fixes it. So, I cannot use any profiles, customize the RGBs and the keyboard constantly freezes.
This is not acceptable for a premium keyboard that costs $160 USD. If you go to the Corsair support forums you will find a bunch of people commenting that they cannot get the software working either. The K95, K70, Strafe RGB all rely on the same buggy software.
http://forum.corsair.com/forums/forumdisplay.php?f=267
I just requested a return to Amazon and ordered a Razer Ornata instead. I also tested out a Logitec G810 Orion Spectrum at a local shop, and the build quality was solid and the romer g keys were nice. I use Logitec software for my mouse and never had a single issue.
I will not be buying any peripherals from Corsair in the future.
Sorry for the long post...