Alot of people have questioned their quailty, but its mostly people with more expensive branded coilovers that do this with out giving them ago.
Look at it this way, if your on a budget they are perfect, they come with a 2year warrenty, most people dont keep their car much more than that anyway, so no biggy.
It comes down to you and your budget at the end of the day.
Just to through this in, I have heard the AP sets that venom are selling for £320 are ment to be good and a grate price.