I started touch typing with qwerty3-4 years ago and reached a speed of about 65 wpm, and i never heard about colemak till about 5-6 weeks ago, so i read about it and checked the forums... and a few days later I switched cold turkey :)
The program i used was klavaro, i think not seeing the keyboard on the screen was an advantage for me, reached 25 wpm in less than a week. The r/s problem only lasted a couple of days and the t/d a couple more then it was cool, the mistake i still make is the g button, i think using the same finger on another row kinda confused me, also i now sometimes type 3 instead of f :D, don't ask me how that got there, i don't even use 3 as e, but i definitely can't blame that one on colemak :D
Currently while typing I feel much more comfortable than i did with qwerty, I currently reached about 45 wpm and it increases significantly every few days without much training.
Due to the cold turkey method I now feel really awkward when I try to type with qwerty, when i get to press j or k I'm like "really?, those are on the home row", but I need to use qwerty a lot on other computers, so did anyone here relearn qwerty as a second language :D
i know that was long but thanks for reading :)