My smoker is a MES 30 Gen 1. Not fancy. No window. No problems with heat diffusion due to the RH exhaust. As with all MES smokers, the therms are totally inaccurate, but a good digital therm solves that problem. It puts out great Q.
As far as problems fitting an
AMNPS in, no problem. But I added a mailbox mod (very simple, very cheap, very effective).
It holds more than enough meat for Miss Linda and me. If you plan on feeding an army, then definitely go for the MES 40. But I can easily cook for 4 adults and 2 kids (that's the most I've ever fed at one time) in my MES 30.
Gary