And of course, it’s definitely a plus when the company that makes your grill includes a multi-year warranty and top notch customer service. Pellet grills are finicky compared to gas or charcoal grills simply because there are so many more parts that require electronics or that have electrical components… which means there is a fair bit more that can actually go wrong or require service at some point.
Regarding getting a good draft, this is a common misconception for pellet grills. The burn pot on pellet grills receives oxygen via a fan unit. As such, there’s no need for a draft to get a measured burn in the traditional sense. Most pellet grills lack sufficient insulation / gaskets, etc to prevent smoke from leaking out of the body. So, unless you’re going with the Memphis or something that uses oven style insulation, you don’t really need a chimney at all IMHO.