I have a 20lb Sausage Maker, had it for 15 years, and it is identical in looks and specs as the LEM. With one exception I think looking at the google pics I found of the LEM, Mine has interior aluminum sides with fiberglass between the outside AL skin. The online specs says it has insulated board. I just finished two nine pound pork butts for pulled pork that came out GREAT. It is easy to hold the temps from 150 to 220 steady by use of the dial knob. It does vary when it is windy out and you need to watch the temps. Make sure you Use a drip pan on the bottom shelf when smoking brined items or place the items in aluminum trays to catch the drippings. I have had a couple flame ups the times I didn't.
Bye the way, today's smoke was in 38 to 41 degree weather and 100% humidity all day. Got the internal temp up to 150 with 4 hours smoke and 4.5 hours without at 180 for smoke and then 220 ending. Removed them, warped in al foil and put in kitchen oven to raise to 190, rested them to cool and pulled it.
Usually the 180\220 gets me to 165 in 7 hours.