I bought a GMG Jim Bowie about 4 months ago, and I have used it a ton. But to be honest, the thing is kinda garbage.
Almost immediately there was bubbling on the paint on the lower front right of the grill. I sent them an email asking about it and they suggested I move the heat shield to the left as it was probably making the right side of the grill hotter, which was causing the paint to chip off. That didn't make much sense to me since I wasn't even getting the grill to it's max temp so why would 1 area start to chip away? But whatever, they sent me some paint to cover it up and I moved the heat shield. The grill still cooks terribly unevenly on different parts of the grill, and I have tried moving the heat shield as much as I can. On top of all of that, it has already started to rust at the hinges on the tray to the right of the grill, and I keep it covered every night. Also I understand you are going to get grease everywhere, but it literally has grease dripping out of the elbow of the smoke stack. So if I have anything sitting on the tray, there is grease that drips onto it.
When I was looking into getting a new pellet grill (I had the small Traeger before and needed something bigger) I had my eyes on the Rec Tec. The reviews all seemed great and their customer service is supposedly fantastic. I ended up going with GMG just cause I found one on sale at Ace for $600, and my wife really was giving me a hard time about spending closer to $1200. Now I wish I would have stuck to my guns and just got the Rec Tec. At this point I will probably try to clean it up as much as possible and sell it eventually, and then just go get a Rec Tec.