It's worth doing - after all it is free. You don't pay them until you get your first flying job (if you want to join then.)
You get the magazine every month which gives you a vague insight as to what's going on within companies. You also get the opportunity to join Best Aircrew who are a BALPA owned/affiliated pilot employment agency who tend to know who's going to recruit and when.
Hey if you don't try it you won't know that you love it.
T - sorry BA didn't work out but glad to see that you're carrying on... well worth it, it's good to be on the conveyor belt.