I have a Bilstein kit on my
Ibiza FR. Not sure which one it is B6/B12... It's the one you can adjust in height but NOT in hardness.
My personal opinion after about two years driving it daily is:
It's complete rubbish!!! On flat roads it gives you immens control over the car and a very sporty feel... I think that on a racetrack built for formula one cars it is the best you can get.
But on normal driving roads with holes, bumps, dents etc... I dare to even call it dangerous!
The setting are so wrong with this skit, that every bump breaks your bones, and even worse, makes you lose contact with the road. If you are braking hard and hit a small bump or gap in the road the ABS will start working and your brake distance will increase greatly.
Some roads even seem to have the perfect distance between (small) bumps that makes your car go into some kind of ressonance. If you dont alter your speed at that point your oil pan WILL hit the ground eventually!
Altough I love my car and the way it drives on some roads, i can not advise anyone to buy it because of the terrible way it reacts to the bad roads which you can encounter all across europe.
Just my experience, nothing more, nothing less!