With my PG500, I've had a bit of a issue with smoke and/or condensation coming back through the pellet hopper, it's not a huge issue, but is kind of annoying that it's a issue at all. I wound up adding a speed control to the combustion fan and I reduce that fan speed sightly, which seems to help a bit. I know one other PG500 owner who added a silicone seal around the top of his pellet hopper lid, creating a tight seal that does not allow any air to flow back through his hopper, he says this has eliminated the issue on his grill. FYI - My slightly lower fan speed also seems to reduce the amount of ash flying upward too, so for me the slightly lower fan speed works well.
My GMG Davy Crockett - it's just a tiny bit to small to get a full packer brisket on - other than that there's not much I'd complain about. The only other thing of note, is recently I went to cook a ribeye roast , set the grill to 'Server' mode, then went to visit my dad who's been in the hospital... when I got to the hospital I noticed the Davy was struggling to mantain 225F like I wanted, I made some adjustment, but things still didn't seem right, the temperature maintained around 200F... Well, there is a setting in the App that allows you to adjust the agressiveness of the PID in cold temperatures, but you can't change that while in server mode... Once I got home, I change that setting, to 'icy' ( it was 30F outside ), and it works great now in the cold... So, the only 'problem' was I din't adjust this before I needed to use it in icy temperatures.
PTG , prone to auger Tube fires...
Junior - Can't control temperature swings very well, especially when trying to cook bellow 250F, very hard to maintain 180F. Far as I know there's really no cure for this problem
Texas - Well... I just don't really like 20" diameter barrel shape cookers... It works just fine, but I likely will never buy another grill that's got a 10" radius and is 34" long, it just restricts the usable space inside the grill way to much.