I bought one of these Unicopies about 8 months ago. I had torn through 4 cheapie-dell keyboards, their $14.00 variety, in the preceding few months. Crap. They felt great for about a week, then, bleh. Rubber.
The sound from these M-clones is amazing. It really lets my coworkers know that I mean business. It also lets them know that their shitty typing skills could use some improvement. I wear noise-canceling headphones, so the Click-Boom is muffled, if not totally eliminated for me. The poor bastards to my left and right can suck it down, get some Bose or Sennys.
Coming home from work, I end up on my Thinkpad. It's a difficult transition, from loud to quiet.
The thinkpad has a great keyboard, similar, I think, to the M. There's a definite resistance on the keys. I buy thinkpads solely because of the Kb & trackpoint.