My WSMs work great w/o any temp controllers. I'm not knocking them, I just haven't needed to use them with the WSM, and I do get "some" sleep at night. Once my WSM temps get set, they usually stay where I want it to the end... if the weather conditions are not bad. In that case, I have to be a little more diligent about tending the pit. For me, the perfect "set and forget" scenario lets me get a few hours of sleep so that I'm not dead beat in the morning. Other than that, I fully expect to have to do a little pit-tending when I cook.
Char-Griller Outlaw w/SFB - "Boss Hog"
Aussie Charcoal Grill - "Piglet"
Cheapie Tabletop Charcoal Grill - "Fire Starter"