I've been brewing with this since August, but keep making adjustments, and have it pretty much where I want it ...One last thing I'll be adding in the next week will be one additional pump for pumping hot wort to the plate chiller.
If I had the room, I'd prefer a single tier, but it's hard to beat the space savings of the triple. 1 MyPin PID for the HLT, and 1 PID for the RIMS tube. I use a manual PWM controller for the boil kettle.
I've used it for 8 batches now , and it works very nice.