I'm using my new MES30 for the first time today. I couldn't decide whether to do ribs or a butt so I did both. The butt is still in there, my ribs are out and resting. The ribs, though, look pretty good to me.
One thing I'll mention (having just started smoking and also using a MES 30) is to watch how much water/juice/etc you are using in the water pan. I'm 95% sure my pork took so much longer than anticipated because of having too much moisture inside the smoker. I filled it halfway and everything else went well but my "stall" lasted a LOT longer than anticipated (7.5lb boston butt took over 18 hours instead of the 1.5hours/lb "estimated" cook time at 225-250F). Next time I'm going to try and keep the pan at 1/2" or less fluid at any given time.