They aren't faulty, they just tend to to scatter the light being projected because the housing and projectors aren't design for HID. You can use them, but it's just better to do it the right way and not blind people.

If you're set on buying aftermarket ones, go for it, there are a couple people on here with experience using aftermarket ones so you should PM one of them. First one to come into mind is Dubcac, so try contacting him about his HIDs on his integra.