Welcome from ND Corman!
You will love your #3. I know I do. I have a Masterbuilt XL and a Big Chief too and rarely use them anymore. Trying to get the temp dialed in is always such a headache. With the #3, I set it and then go to bed during an overnight smoke or go shopping or shoot some pool during a daytime smoke. No matter what, I know the temp is going to be controlled. I just need to be around when the internal temp starts getting close to being done.
We have a great group of guys and gals here that are always ready and willing to help with any questions that you may have.