Excellent keyboard but limited under Linux
I've been using this keyboard for almost 2 years for my professional activities (CAD, office automation, SysML, etc.) and the comfort of use is really excellent. I haven't had the opportunity to use a better keyboard from this point of view. The only (big) negative point is that the macro keys don't work on a Linux OS. That's why I'm giving it 3 stars, otherwise it would have been 5/5.