To contrast and compare:
I joined the club last year, am fully paid up and have perhaps only used the facilities of the forum, plus received the odd magazine. Now of course, I'm building a car so perhaps looking for different things from the club but I feel the information and help I've received from the club has been worth far more than any annual fees. I don't see a 'slow' forum, and don't see it as a problem. Back in my youth (though I'd like to think I'm still in it), I was a moderator on the MINI2 forum. The problem with large forums, is you can get cliquey circles, and some good threads can be lost in a sea of crap. You don't get that here. Swings and roundabouts I guess, not a lot of posts, but not a lot of chance of missing stuff.
I'm yet to attend a local meet (though really should make an effort soon), but am aware that this forum is far from the be all and end all of the club. The magazine gives a great idea of the sheer scale of the stuff that goes on in the different areas, and I hope to experience some of it soon.
In short, give it a go, see what you make of it...