I use a Masterbuilt at home and have for 3 years now. It does a very good job. You can use any chips or dust which you can load from the side without opening the door. The door has a window which blackens quickly and I'm too lazy to clean. The remote is priceless and spoils one quickly. The 30" that I have does fine, but it is limited. I can't do more than 1 whole turkey and it can't be over 12# + or -, but that is generally the safe size to home smoke anyway. It works just as well in a 40 degree ambient as it does in in 95.
I don't know about parts, I haven't needed anything yet.
I would think it is one you might want to put on your list to consider.