I would cook something at the known set temp, like a pork butt, something fairly easy. Or even better, baby back ribs, because they are easy and don’t take as long as a pork butt. Set it at 225* and let them go, no peeking until about 4-5 hours and then check them. If they are just about done, your temp inside the box should be spot on. If they are overcooked, then you know there’s something to be correct, perhaps the dial is off a bit. But It’s hard to monitor a box that has nothing inside to sync the heat. Most on here will tell others not to monitor the internal temp because of this and it will drive you crazy as you chase the temp.
Those are just thoughts for you to consider, based on what many have said on here. My dad has a Model 2, has never had an issue with it. He loves it in fact because he spins the dial and knows he’s going to have good food when done.
Hope that help a bit.