Just my experience driving a few cars with them fitted. There's nothing wrong with them, but i feel for the price there are better alternatives. I think they are fiddly to setup, if you run them hard they can burst and they felt 'soft'. Bilstieins are race proven and you can still get all the parts to build yourself a set of group A spec coilovers (including stupidly light magnesium rear bodies!). Plus no adjustment, so you spec them, fit them and forget them.

Plus a well respected rally man kind of hit the nail on the head when he said a set of the 3 way BAD cost the same as one corner of proper 3 way stuff...