Nanuk, welcome! Smokeasaurus gave you the best answer you could hope for. While the Cookshacks are great units, you'll pay triple, and they don't have anything comparable in size to the #3 (best value with Smokin-It).
Here's another reason to go with Smokin-It over any other brand: The forum you just joined! Take a look at any of the other manufacturer's forums and, though they've been around longer than the 2 1/2 years we have, they absolutely pale in comparison, as far as volume of active participants and posts! The "support network" you will find with SI is second to none! You will be hard-pressed to find negative posts here. Have any owners had problems with their units? Of course...they are machines built by man, so nothing is perfect. BUT, the problems are always resolved, either by us figuring out what the issue is, or by Steve (the owner of SI).
Also, don't be fooled by CS's digital controller. You will hear/read about analog controllers (like what comes stock on the SI) having temperature swings. It is true, you will see swings of 10-20°, but the temperature "averages" to what it is set at. One way we get tighter control than that is to add a P.I.D. controller, like those made by Auber. This is a scientific controller that will literally hold box temps within 1-2°, very consistently. While you don't need that kind of tight temp to make great Q, some of us BBQ nerds really like it (like me). The point I'm making about the digital controller on the CS is it is not a P.I.D. controller. It is essentially a analog controller with a digital display. It also has temperature swings! I wouldn't have guessed this, but one of our members who owns a CS actually tested/tracked the box temp and discovered this. Plus, it that CS controller goes out, replacement is several hundred dollars.
And that's my 2¢, as a proud owner/active user of a model 1, 2 and 3, with Auber controllers!