I'm very happy with my #2, but I wouldn't have regretted getting the #3. Something that Tony (DivotMaker) indirectly reminds me of quite often is that the larger size is really only an advantage if you're smoking a lot of the same thing. (Or things with similar cooking times) It's not the best idea to load up a smoker with a brisket, several racks of ribs, ABT's, and chickens. If you're cooking up several briskets, or loading it up with half a dozen racks of ribs, it's all good. But, if you've got a pile of things with different cooking times, you'll be opening the smoker far too often.
So, take a look at what you plan to be smoking, and how many people you'll be serving. For my needs, the #2 is great. My first smoke was 3 racks of ribs, followed by a whole chicken, brats, and a tray of mac n' cheese. The next smoke was a ~6lb brisket. The next, more ribs. The next,(Father's Day) a 12.5lb brisket, followed by ABT's and a Fatty. Then did some St Louis ribs last Friday. The #2 performed admirably for all of these. Now, I've got a ~16lb brisket waiting in the freezer, and my admin at work is bringing me another ~7lb brisket.
Once I learned the best way to load it up, and the limitations of cooking different things at the same time, I was much happier and got much better end results. My house fills with neighbors every time they smell smoke in the neighborhood, lining up to eat. I've only had mine for just over a month, but it's keeping me happy no problem.