I do have one on my freezer conversion. To be honest it is a new addition, and I haven't had a chance to really use it yet. In testing, it seems to heat about 20 degrees hotter than my capillary tube thermometer and my baby dial indicate. Kicks back on just a few degrees less than the set point. I don't know if this is by design or if there is a calibration I need to do. 20 degrees seems like a big range. I would think about 10 (5 either side of the set point) would seem about right, although I've never tested my home oven with the same degree of tenacity I've given my smoker so maybe this is normal. It will be nice to not have to "babysit" the smoker when I'm doing alot of what I do with it. Previously, I would have to really watch it and adjust dampers, etc. to get temps up. Then if I went to bed, I would have to get up every few hours to check it, or it would overheat and the fat would start to run out of my products. I'm sure it will be better for that. Bombo80 also uses one on his refer conversion, and has alot more experience with it than I, so again if he doesn't chime in here PM him. Also, it is not totally wireless, in that it comes with an outside outlet box, but you still have to wire in the outlet which is not rocket science. I am still kind of experimeting with my heat source as well, so it is nice to have the option of just plugging it in. It could be wired direct if you chose to do it that way. By the way what is the PID method?