I have an MES30
and I second everything others have said. Main issue is fitting something like a rack of ribs, but I dont really mind cutting them in half. The only time I smoked a brisket I separated the point and flat. Both came out fantastic.
One issue I have learned is smoking in very high ambient temps (like 90F and above) the element doesn't cycle on and off as much so it doesn't burn chips at a good rate to produce the smoke. Folks here would suggest other devices/things to supplement the smoke from external. I dont want a bunch of extraneous stuff to overcome the issue, so I learned two things:
1-A propane or mapp gas torch (which I already had) can be blasted through the chip loader hole to ignite the chips, you just have to "become the element" until you get to the desired smokiness. With these units, when the element is cycling well you have to feed chips fairly regularly anyway, so it's not a set it and forget it thing in the first place...they have pellet smokers with auto-loaders for set it and forget it.
2-I just dont use the smoker in the dead heat of the summer. I can live without the taste of smoke for a couple months. There ARE other foods!
I DID have to replace the element at 9 years old. How the unit is stored matters, like anything else. Mine sits in a climate controlled (AC in summer) or cold garage in the winter (I never let it freeze out there, I have foodstuffs stored out there). Anything with wires, etc. is going to deteriorate faster if it's stored where temperature extremes and humidity get to it.
Also, I like having the digital display with probe and remote. But you have to be careful...graze the remote the wrong way and not realize it and you can turn the smoker off accidentally. I've also read of those electronics on the smoker going bad at some point. You can make up for not having that feature by having your own external thermometer with a probe and remote, but those things can be expensive too, for something good that is.