There's a new bullet smoker in town folks. It's called the ProQ and is brought to you by Pro BBQ LTD.
I haven't seen one up close yet, but based on the pictures and brochure on the website they look promising. Their modular construction offers the flexibility to grill, roast, and smoke with the same basic unit.
The basic unit comes with a bottom section for the charcoal grate, middle section for the cooking grates, and top lid. You can add additional capacity by adding the optional "stacker" section.
Models available include the Amigo, Buckaroo, and Frontier, with the Stacker option to add additional capacity.