Evidently there are some good eBay lights, and some bad eBay lights.
I've heard of a few that have them and like them, but others that had a lens fall off a housing within a couple of weeks and others where the lenses stayed on, but the reflector rusted within a couple of months. Just went through this with another guy who bought a set and, although they seemed to be of decent quality of manufacture, had the crappiest beam pattern imaginable and he's going with the Hellas now.
IPF, Delta (BCB), Hella, Cibié, Carello, Bosch and a few others all seem to have the beam-pattern thing down pat.
Cheapies are always a gamble. Gamble well and you'll be happy. Miss the bet and you'll end up buying a more expensive pair later.
Paul