Rob, the guys are right - the Auber is definitely NOT required to produce stellar Q! I used my stock #1 for almost a year before using one. With that said, let me add that once you use one, you won't want to go back to the analog controller (especially if you're much of a techie, or "cool tool" guy). I used a flip phone for a lot of years before owning a smart phone. While it worked great, and met my needs just fine, I wouldn't want to give up what my smart phone can provide and go back to it.
The main advantage to the Auber, aside from +/- 1° accuracy, is the ability to program 6 distinct steps that are triggered by time or internal temp of the meat. Say you want to smoke at 200° for 3 hours, then bump up to 235° until the meat hits 155°, then "hold" the meat at 140° for 2 hours? No problem! Set it, forget it, come back when it's done! Can't even do that with an $1800 Cookshack! I won't smoke without it now.
Is it something you need right away? Definitely not. Are you still spending less than the nearest competitor (Smokin Tex), with the Auber included? Absolutely. Plus, when you get ready, it's a one-time purchase...it'll last a long time, if cared for.
Just 2¢ from someone with experience with both.