Thanks Phil and Hi Bconrey - sorry for coming late to the party on this discussion. I recently installed the PelletPro on my PB 200FB. Yes, the pulsating fan it weird to first hear when you're used to hearing the fan going full blast previously BUT...that is how it works in order to try and hold those temps within 5 to 10 degree.
That said, I noticed something pretty interesting last week, when doing some St. Louis style ribs. I put a grill temp monitor on my grate to see what the actual grate was at during the cooking process as my ribs are sitting right on it. Found that even though I was holding a pretty good temp at 225 on my dome and built in thermometer, the temp at the grate (and meat) was 30 degrees higher! So I adjusted downward by 30 degrees (to 195) to cook at my desired 225. All was well for a bit BUT, close to the 3 hour mark, I noticed the temp dropping. At first I thought the fire went out but when I pulled the grates and shield off, I could see I was having burn back! Dang it! Turned it off and then back on and hit the Feed button to push that out. Then I was able to fire it back up and the the remaining "2-1" of my 3-2-1 ribs without further issue.
I believe that burn back happens more at lower temps as the pellets are barely being fed and the fan is running much slower and pulsing. This bums me out a bit as one of the reasons I bought the Pellet Pro PID controller was to do a long brisket (overnight) cook and I now have concerns that I'll have burn back on this overnight cook.
I had read that someone thought it could be the sawdust in the pellets that can contribute to burn back, so for my next cook, I'm going to clean out the hopper and sift the pellets before using them, to test that theory.
Let me know if you decide to go with the Savannah Stoker. Is Pellet Pro going to honor your return? I thought I saw in the paperwork that once installed, they wouldn't take it back?