A bit late to the party buuuuuut.......we have the CharGriller Duo, very similar to the above but on the left is an additional section that is the gas grill. Great combination. Before I put the side firebox on smoking meat was a pain, I had to use 1/2 a roll of foil to try and channel the smoke. Temps were anywhere from 200-350-a mess.
Added the firebox, got some hi temp silicon and sealed it up. Smoked ribs and brisket for the 4th, temps stayed right at 225.