I would like some feedback from anyone who has ordered one of those generic ebay underdrive pulleys.

but A) Please do not start discussing how underdrive pulleys are damaging to the longevity of the engine (torsional stresses, bla bla bla)
and B) Don't just say things like "ebay stuff is crap" or "you get what you pay for" or anything similar. I'm trying to get honest feedback from any owner of this product. Thanks