I have heard both good and bad on FK's. Personally, I would go with Weitec or Vogtland if I was looking for an inexpensive coilover. If you are willing to save up some money then Koni, Bilstein, K&W, H&R, Eibach are names you're going to want to get to know.
I recommend Eibach, H&R or KW. FK or similar companies are very popular here in Germany but their qualitiy is lousy. So, if you want good quality for your money, invest in well known comp. otherwise its losing money.
Limoni is equipped with an Eibach adjustment kit and I'm really happy with it (for more than 10.000 mls)