I don't know anything about this particular brand but they are almost 50% cheaper than the Alcons:
http://pbbrakes.com/brake-kits/bmw/x...brake-kit.html
They actually make a big brake kit for the rears as well but are still developing the electronic braking function. Oddly, they'll still sell you the rear brakes but you have to acknowledge that "I understand the handbrake function will be lost". Is that even legal? Who would buy that?
http://pbbrakes.com/brake-kits/bmw/x...brake-kit.html
Lastly, Stoptech makes brake kits that consist of the rotors, pads, and brake lines but are only OEM replacements using the same calipers.