Basically, I am very satisfied. Therefore, only a +/- list:
+ Lighting is adjustable Class
+ The function keys for special functions has Logitech times integrated class - no need to adjust or so - works instantly under Win8 (64-bit)
+ Stop class (especially at Spacebar - even if you left or right strikes only at the edge - so I understand the criticism of some this is not)
+ Keys remodeling large delete key, for pasting up etc. I find great ideas - I was skeptical at first, so it will be even more nit going :)
+ Key arrangement, shape, size, -wölbung: I was skeptical at first - this is really great! Tippe faster than ever blind and after a short familiarization.
+ Flat, stylish
- I need the function keys - which are the only keys for which I have to constantly look at the keyboard. The F-description is not to illuminate, but only the special functions - which I find really sleep stupid.
- Arrangement of lighting whether Num Lock, Caps-Lock is active etc., is on the bottom right under the ball of your hand. Again, I need constantly for 3D CAD the number pad with or without NUMLOCK. The idea I find modest.
Therefore, 4 points. The two negative points I can get along, but I would no longer give out. The rest, however, I find really good.