They are great, I have them on my track focused 'beeza. However if you read what I said..
I said if you want to slam it on its arse, dont go for Eibach coilovers, as they dont do that. I have it as low as it will go on the back, and some (adjuster cups out) and for me its perfect (front isnt all way down but low enough for a TDi's sump) however, for all these 'euro geeks' they wouldnt cut the mustard as you can get atleast a finger in the gap between my 16' wheels and arch (albeit I have zero weight in the back as stripped so id imagine it would be slightly better with the seats etc in)
If however you want coilovers that keep your car on the road (track or whatever) I cant fault mine, and I have been in several other
Ibiza's ranging from springs to coilovers and IMHO not one gives the some feeling of confidence on a bend, yet isnt TOO crashes on normalish roads.