I agree that the WSM will hold temps like the needle broke on the thermometer, and I have cooked for years on my 18WSM without a temp controller with no problem. But I put an IQ110 my WSM last summer and love it. It makes my WSM as easy to use as the oven in my kitchen. Throw the coals on, set the temp on the dial, and walk away. My WSM is usually within a couple degrees of the temp I set on the dial at all times. This allows me to smoke foods when I am in doing other things and really don't have the time.