ive used them 3 or 4 times for regular maintenence items (oil/fuel/air filters, intake/valve cover gaskets, spark plugs, dash/obc lights, washer pump, etc) I usually get my stuff 2nd day and their prices are pretty good on that kinda thing.
EDIT: also my gaskets were Reinz which is one of the many brands BMA offered. So i dont *think* its all crap. But i guess that doesnt offer much info into the original question....whoops.