I'm only interested in Resolume as this is the one I'm currently doing best at. Downloaded a few demos and Resolume seems the most intuitive to me. But I will ask some people at the meetup... Thanks!
Well, since you've already had a play with a few, that answers the question. :o)
By the way, if you're already playing with it, I don't think a course is going to help you any. Maybe make you poor, but not really help. ;o)
You will get the most out of it by tinkering yourself and trying out more and more clips, different combinations, etc.
I think the new Resolume (v3?) uses hardware acceleration, which the old one didn't, consequently running like total rubbish if anything else even thought about happening at the same time on your machine.