I use a CyberQ on my 22" WSM. Rock solid temp control. I put my big meats on and go to bed. Never had an excursion of more than 2 or 3 degrees. I started out with a "budget" controller and did not have a good experience. You usually get what you pay for!
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Two Modified WSM 22, iQue 110, CyberQ, Traeger Texas, Smokey Joe, Weber Gasser