DaveNH the 40" has a higher watt element 750 Watt. The problem with a 40" for me only shows up with big loads. As I said above I did 8.5lb pork/butt one only, last monday. Preheated 1 hour at 270, loaded the boiling water, loaded the meat, and 20 minutes later was at 225. As for recovery, after 3 or 4 hours I have very little problems unless I fail to manage the door well, usually recovery with a big load is 30 minutes, and with smallish load 15 to 20 minutes. I stress, manage the door open/close is critical, I usually have someone else open and close the door, and usually try to pull the whole MES rack out, rather than pickup meat, plus I try to make sure the element is ON during this period.