I switched to Colemak pro'lly 15 years ago, and while my fingers certainly move around a lot less, I don't think my top speed on typeracer.com has improved over what I was able to do on QWERTY before switching, nor do I seem to make fewer errors.
On the whole 1) I do like Colemak a bit better, but 2) I don't think it was worth the switch, although 3) it's certainly not worth a switch back. I think 4) if everyone started with Colemak things would be better, but 5) given that they don't, I'm not sure I'd recommend anyone else choose Colemak over QWERTY if they're learning, based on my own experience.
What's kind of weird is that with all the ink / bits spilt over this issue, all we have are two 50+-year-old studies whose raw data are unavailable. How hard would it really be to re-run an RCT?