@papawemba , thanks for the detailed review and comparison!
I also signed up for Jack Talty's course. I'm a beginner on concertina but a long time musician on other instruments. I think it's pretty useful for me and I really like that he uses the teaching of a tune as a vehicle for a technique lesson. I like his playing a lot too. I do agree that there aren't really lot of tunes considering it's 3 parts, and some of the tunes I'm not interested in learning tbh ( Wellerman? no thanks, hee hee).
I will say that, oops, the McNeela website makes it easy to sign up for the subscription, but difficult to cancel ! However, I assume it's just a case of them not having their online platform all in order. I ordered a case from them and it came quickly, well-packed, at a decently price, so I'd order from them again.
I'll probably try all three courses, as well-- maybe on to Caitlin next!