I use the Repti Fogger and the HygroTherm. Both work great for me. I did have to replace the fogger because the first one quit working, but that was because I didn't use distilled water. I only use distilled water now, and I haven't had any problems since.
As for the HygroTherm, it's been pretty accurate. I have two light canopies on my tank, and the HT is connected to one of them to control air temp. Obviously the fogger is connected to the HT as well.
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