Funny you should ask, I just got one in May for my birthday, I played around with the built in controller but had some really horrid results, swings of 90ish degrees. Now having said that, I asked for and received a PelletPro PID controller for dad's day and got it installed this past weekend and so far pleased with the temperature results, going to get some stuff cooking on it this week.
Here's where I started out, this was the first smoke on it had a rough time with the output, it was dry on the tails and all in all not the kind of Cue I'm used to putting out, a lot to do with the temperature swings for sure.
I'll include the photo's so you can see how I did it should this be a route you decide to take all in all, I think we are out just over 500$ with mods to it.
Here she is getting ready to be set on her stack side
Had to pull out the grates so they didn't flop around
Taped up the pellet box lid instead of emptying it out, worked out well
Here's the new controller with the optional mounting plate, which it turned out was needed for the
PitBoss 820
Two screws here and two more on the bottom edge of this plate pulls off this protective cover so you can get at the internals
Here's how she looks stock pre-cutting the wire management that I will replace later after the swap
And the back of the stock control board, wish I had thought to get a shot of the PelletPro so you could see it, for reference, Yellow = Fan Red = Motor and Purple = Fire, the White/Black wires are for power
Here you can see the gap that the cover creates so I headed out to the hardware store and got some tapered head M4 and M3 bolts and some washers it took 4 washers a bolt to take up for the gap you see here
The controller covers up the plate mounting holes fairly well, I wish it was just a bit taller but beggars can't be choosers
Here's a couple shots to show you the wiring conversion, Yellow from the smoker goes to Green/White, Red goes to Blue/White and the Braided leads for the fire pot go to the Red/White on the controller.
I did reuse the pit probe from the smoker as it looked sturdier than the one SmokeDaddy included with the kit, here's all the wire management in place before buttoning it up
And here's the readout when it was set for 225, all in a worthwhile upgrade for sure. Where to find the PelletPro:
http://smokedaddyinc.com/pid-digital-controller.html