I'm really just posting so I can be included in the "how many people use Colemak" stats :-).
I am a 80wpm Qwerty typist. I installed Colemak on both Windows/Mac and used Typefaster to learn. I am doing the "Qwerty by day, Colemak by night" approach for 2 weeks. In about 1 more week I will be ready to switch over to Colemak full time and start building speed. Right now I'm 20-30 wpm based on Typefaster numbers. I spend 5-10 minutes per day on Typefaster--that's all it took me to learn Colemak--indeed, easy to learn.
I'm already looking forward to not having carpal tunnel syndrome later!