I don't have one, but I've seen them in use many times and they produce a solid final product if you like the cabinet style units and charcoal.
A number of members here own them, they just may not have seen this thread yet. I'm sure they'll chim in.
PM Muzzlebrake for details, I know he owns one and likes it.
22" WSM & Kettle
Former owner: Jambo, Klose BYC, Med. Spicewine, Pitts & Spitts, XL & (2) Med. BGE's, (2) 18" WSM's