I've literally tried all the different OEM controllers out there (there are only about 4-5 unique PID controllers out there, probably from the same manufacturer in Taiwan/China).This one has been by far the best, for my 600D. While the ramp up rate is a bit slower than others, and there is usually an overshoot initially (also reported by others), after 5-10 minutes, it stabilizes and runs like a champ.The WiFi capability is also very very nice to have! Because of this, I've retired my wifi thermometer. With 3 probes, this thing is perfect. I've had 3 turkey breasts in smoking at the same time, and was independently monitoring each since there can be hot spots, etc... and they came out perfectly (thanks to being able to stagger the cooking times).Temperature range is great and goes down as low as 160F.Some caveats:The software appears wonky, but it works (I'm on Android). Pairing is fast, and monitoring works good. The only thing to watch out for: ITS ON CELSIUS BY DEFAULT! Once installed, if you prefer F, just change a setting in the app and you're there. This slipped by me on my first use, and I ended up making some charcoal out of chicken LOL.The PID seems quick to react on temp changes, so keep an eye on your pellet supply. Rather than riding the temperature peaks and valleys in a more relaxed fashion like some of the other controllers I've tried, this one goes for more precision at a cost of higher fuel use.