If you are looking for good smoke flavor, as I mentioned in you other thread, try to sample some foods cooked on a pellet grill; without any sauce. My experience with pellet grills; mine, and using other pellet smokers, you may not get the good smoke you are looking for. I have a GMC Jim Bowie, I've cooked on a few different Yoders, and huge commercial style pellet smokers; and ate food from these cookers. You are not going to get much smoke - if any.
Are they convenient? Yes, and they maintain a fairly good temperature range; at least most of them. I use my pellet grill as I would my propane grill. If I want smoke flavor I use one of my charcoal burners, and control them with my Stoker. If you are burning wood you shouldn't need to add wood chips to add smoke flavor. If you are burning charcoal, use wood chunks instead of chips. There are times when I will apply smoke with my Bradley, then transfer to my pellet grill.
I would suggest you do more hands on research before you pull the trigger on any piece of equipment. Each type of cooker has their strengths and weaknesses. You need to determine what fits your needs the best.