I’ve only built them, never used one from a manufacturer.
I would like to get one of the cabinet style electric pellet smokers though, but they cost too much for how often I’d end up using it.
The ugly drum style smokers are easy and cheap to build and run. I would look into making one of those if your new to the smoking thing. Probably cost about $100
Also I wouldn’t risk a brisket for your first smoke, pork picnic roast is a good cut for pulled pork because of the large bone in it and large fat cap. Helps keep it moist even if your temps spike and is more flavorful than the Boston butt. Also is 1/4 the price of a brisket so you don’t go broke while you learn.