Haven't mounted it yet so I don't know how it handles on the car but from what I can tell just by the feel of it and the way it looks it might be promising, the are 2 reasons for the 4* rating is that there is no contact number if you want to ask something fast, they respond pretty quick on the Facebook page or emails but would be faster by phone and the 2nd reason is even if they answer quick they only give generic answers, I asked what do I need to buy besides their kit (I don't want to use anything from the old suspension) and everytime I asked I got the same answer: no extra parts needed, old parts are swaped and if I dont want to use the old ones to contact BMW. Will come back with an updated once I install the kit and drive with it for a few days.