Hey Kevin, I have to say that I am nothing but happy with the RK2 considering it's price. It does keep my temp under control. It uses one channel to control the heater (with a cut-off in case heater control itself fails) and one channel for my chiller (Which is a bank of fans on the sump) Since putting water in, getting it to 79 degrees, it has not had a variance of more than .1 of a degree (currently that mostly consists of heating the water rather than cooling it).
Here are some pics of the rockwork in place (still missing the seeder rock).
I had what I thought was a better setup, but I couldn't pass the magnet everywhere around it and that was not acceptable for me.
The SCWD is working well, but a little noisy for me. (Kinda a creaking sound)
I'm a little disappointed in my flow...so many elbows that its cut down more than I thought it would be. May have to bump that Quietone (which isn't that quiet) up to an Eheim or something. Any recommendations for me? (I don't want it generating too much heat)