i experimented them on my integra before, all i can say it's wasn't a bad experience at all until my the cheap kyb (silver) shocks blew on me..
i had the setup for almost a year, i adjusted the height over 5-20 times for the seasons & preference. the ebay coilover showed no sign of wear or cracks at all & the quality wasn't bad. i was impressed. i forgot which ebay user i bought it from, i'll try to find his name, because all his stuff was good..
i decided to go with h&r + tokico blues.. they almost feel the same as if i had the ebay coilover with the kyb shocks...
if your getting the ebay coilover i recommend getting good shocks..