I've got a Stumps Baby and love it. However, when I first began (which was about eight years ago) I started out on a very cheap low end grill/smoker offset.
The old timers will tell you that it's not the smoker it's the cook and ultimately they're right. Smokers like Stumps, FEC, Backwoods and other "expensive" units cut the "Baby sittin" of your unit WAY DOWN. But here's what they won't do:
1. They won't teach you that putting your meat in your unit while thick, gray and white smoke are puffing out of your smoker will make your Q taste like crap.
2. They won't teach you that having a good, hot, "clean" fire produces the best Q.
3. They won't teach you that soaking your wood chunks in water will make your fire smolder which will hinder point number 2 on this list and produce point number 1.
I guess my point is that the things that keep people from making great Q has nothing to do with the smoker but more to do with what the user knows or doesn't know about cooking meat on a grill/smoker. Experience accompanied with trial and error will ultimately make you a good Q'er.