It's been around three years since I started my colemak journey and I decided to make an update on my experience. Initially I practiced very hard with Colemak for several months, doing daily typing tests and practice with programs such as Amphetype. Since then I haven't really done any typing practice and just have been going about my daily business until this last week when I decided to compare my starting speeds with my current speed.
My typing speed was at about 90% of my qwerty speed after three months, 74wpm (typeracer 10races without selecting text). In the 2 1/2 intervening years my comfort with the colemak language has definitely improved and with it has come a slow increase in typing speed. My typeracer scores this past week are 88wpm (10 races without selecting text), this is 106% of my old qwerty speed. This 14wpm gain won't make me better with my job and I was perfectly happy with my old speed, but it's nice to see that my increased comfort has a tangible effect. I did some Amphetype typing and scored 84wpm avg with 98.4% accuracy. Finally, I did some 10fastfingers runs and got the following, 103wpm normal, 88wpm advanced.
Obviously very subjective but I feel very comfortable typing and I haven't had any of the wrist/finger strain that I used to have with qwerty. I really do feel that I can tell the difference in daily typing, especially after a long work day, when my fingers don't feel sore and overused. So I have to say that this has been a huge improvement for me and makes me happy to have switched just for this increased ease of typing.
At this point I type slightly faster and more comfortably than ever before and I'm happy to have switched. Especially because of the comfort, I feel like typing in Colemak is something that I'll benefit from the rest of my life.