I've been running the budget coilys for about 2 years now. In short
* They were better than 23 year old f**ked shocks
* They make driving down the motorway at high speeds very uncomfortable
* You can't drive over speed humps at any speed (not because of the height, but the rebound)
* Driving down anything other than a smooth surface is pretty hard
* 2 years on from fitting, they aren't much worse, but its hard to get any worse
My advice, steer clear, I've had them on a lot longer than most folk on here and have a pretty rounded experience of them.
As people have said, get the Weitecs or save £800 and get Koni coilys.