I have one, and use it in concert with my smoker as the orioin is NOT a smoker. When I am in a rush, I will use very heavy smoke for 2 hours on the smoker then load up the Orion, after a total of 5 hrs between the two, you can have 15-16 lbs of perfect pork.
The orion is a closed system, load the meat, close her up, and then load the 13.8 lbs of match light around it. Make sure it is placed is a safe area as it turns into an inferno!!!
It uses high indirect heat from outside, convection and steam inside.
Chicken, turkey and pork work excellent in it, ribs (you can load 6 racks of BBs ata time) need to be direct flamed after cooking to 'give them the look'. I have not tried beef in it. Remember, this is NOT a smoker...