I have had one since they came out YEARS ago. It is a decent piece of equipment and it uses a eheim pump for recirc. I feed mine with a maxijet 1200. However, if you have ahuge tank, or a tank with a lot of SPS, you may find it small. When my tank was packed with SPS, it had a hard time keeping up. Instead of buying a new dual chamber reactor, I simply built a second chamber for the K2R. Works great. My tank used to be full of SPS (restocking it now) and it had no problem keeping up with the Ca demand.
