Had 2 clicky model M's, now have 2 K70s - K70 has everything I loved about the M. With the K70, you've got the 4 different kinds of switches (linear/non haptics, clicky/not) - I'm on the red, linear, non-clicky. The build quality (made in Germany) is definitely solid. I've been driving LEDs from my .vimrc - that's a trick the M couldn't do.