I have the K860 keyboard. Very nice and exactly what I wanted. One of the problems that I have noticed is there seems to be insufficient space between the backspace key and the print screen key also the \ key.

I like the way the keys movement is extremely smooth and the ergonomic design is very good too!

The overall design is easy to use and for people such as myself that have arthritis or other hand related health problems the ergonomic design is AWESOME. My hands don't cramp up on me when I use it.