I am looking at two models of Masterbuilt propane smokers: 20051311 & 20050412. Both are the two-door models. The 1311 model is $189 @ Amazon. The 0412 model is $179 @ Home Depot. Except for a few subtle differences, I cannot see any major differences between them. I think they both have insulated doors & the vent systems are the same. Can anyone who has seen or used either of these models please inform me of anything that I may be missing?