about ebay, you should know this - they will put the term "jdm" on ANYTHING to help it sell faster....when it comes to coilovers, a general rule ive come to accept is "you get what you pay for" -- if they were cheap, then of course, its probably not going to be as great as a name brand suspension set up....
i've bought cheap coilovers in the past as a fix, and although they lasted, they werent that comfortable of a ride for daily driving....when i got a more reputable suspension (skunk2) - i noticed the ride quality GREATLY increased....
hope that helps, a little