My guess is you've read "What Doesn't Kill Us" and maybe Scott Carney's other book(s). I did a week long course in Poland - I can't say enough good about my experience, I'd do it again (and am planning on it).
I've not done weekend / afternoon type workshops. My guess is this is going to give you a bit more than what you've done on your own. Group breath work has a whole different flare to it (in a really good way, and I'm not an overly social person). So, it may just be an upsell into the longer courses, but I will tell you learning breath work in a group setting has an energy you don't get on your own. Plus you may pick up a few trips to help you hone in on control. Just my $0.02.
I've not done weekend / afternoon type workshops. My guess is this is going to give you a bit more than what you've done on your own. Group breath work has a whole different flare to it (in a really good way, and I'm not an overly social person). So, it may just be an upsell into the longer courses, but I will tell you learning breath work in a group setting has an energy you don't get on your own. Plus you may pick up a few trips to help you hone in on control. Just my $0.02.