I think that this component is really great, but the best for me is the quality of the OSE support.
I bought OSE Membership Control and the phpbb addon to do a Fan Club website with annual subscription.
Everything is working fine, the bridge between joomla and OSE is totally transparent. Very good work.
But the best for me is the support they give to me : I'm not experienced and sometimes I don't really understand what I'm doing. I ask for help to the OSE support and they really take care about a newbie like me. Now they solve my problems and everything is working fine.
If sometimes you don't know why you have payed a software, with OSE you will know.
Sorry for my Swiss french English, and long life to Joomla.