There were some hardware and firmware updates that they sent out to earlier adopters. I believe they have recalled all of the older units and are only selling updated ones now. In my case it was a replacement auger and chute and an insert that increases the angle of the pellet hopper into the auger chute. It was a rough launch, but now I couldn't be happier. I use it as a smoker (loin) and as a gas grill (steak) replacement.