After one month, I find myself with workable muscle memory and about 80wpm/98% accuracy on typeracer. Here are some reactions:
The excellent:
As far as I'm concerned, Colemak is the optimized keyboard layout with the best shortcuts. In addition to preserving many of the QWERTY ones (ctrl+zxcvaqw, s on the same hand), you also get several moved closer:
QWERTY Position -> New QWERTY Position
r -> s
t -> f
f -> e
This makes the shortcut density practically 100% on the left-side. After remapping Ctrl -> Caps Lock, I end up barely having to move at all! I'd say the only improvement, apart from the minor p, would be having Caps as Ctrl by default:
green - unchanged shortcuts
dark purple - improved shortcuts
light purple - improved shortcuts that we probably won't actually use
orange - equally good shortcut (but requires relearning)
red - deproved shortcuts
The practically questionable:
Rolls are very dependent on the quality of your keyboard. The rolls that I perform after I clean the keys are noticeably better than those after gunk has been allowed to gather. I'm prone to many more errors when I've left it for even a few days, and this makes for a very inconsistent typing experience.
The weirdness:
I've felt, the entire time, that I've become dyslexic on the keyboard. I would very often type letters in the wrong order, even to the point of switching letters between wdjacent aords. Part of this may be due to "the other hand" reacting faster than the current one, but part of it I can only attribute to actual dyslexia.
All in all, I think I would've preferred something like Dvorak - alien to QWERTY and not dependent on rolls - if it had comparable keyboard shortcuts. The shortcuts, I feel, are Colemak's hugest killer feature, but are not fully taken advantage of due to its default Backspace -> Caps Lock mapping.