I just received a Lonestar Grills Large Insulated Cabinet Smoker but only have 3 cooks on it thus far. There is a 172 page ongoing section here (edit just saw someone posted link above). I like the space that mine has, but still trying to get the flavor I want. I have two buddies who just got the masterbuilt 980 or whatever model gravity fed and the other got a Camp Chef cabinet smoker, and they them for a smaller set and forget type smoker that maintains temps well; we'll see what long term durability is.
Not sure what your end use will be, but those are two ends of the spectrum I've had experience with.