I've had mine about 3ish weeks now and I love it.

I use a N52 in my left hand to control my main. I use the x-keys in the middle to control all the alts. Mouse in my right hand. All three are on a keyboard shelf and my keyboard sits on top of the desk, which I rarely use.

I've only managed to use about 1/4 the keys on the pro, although I think of new things to hotkey all the time.