I have a six shelf CB70 and I couldn't be more pleased with it. It runs off of one thermostat and one outlet. Assembly was easy if you are handy at all, everything fit together perfectly. I opted for side heat plus back heat, as I was worried my room would be a little cool in the winter. As it turns out, it maintains temperature perfectly except for the bottom tub which runs 4 or 5 degrees cooler than the others. I haven't been using the bottom tub for that reason until yesterday, I put a snake in there to see how it would do. I'm keeping a close eye on her, I may just have to use this as a five shelf rack, but then the bottom tub has been useful in storing assorted snake paraphernalia. I'd show pics, but they wouldn't be any better than theirs.