Not sure about pellet stoves but I've dealt with a number of wood stoves in my day. Most recent has been a Quadrafire fireplace insert. I am extremely pleased with how it has held up over the last few years. Very efficient and with a quiet fan. I would highly recommend Quadrafire. Only problem was last winter when the flue seemed to be clogged and I filled up the house with smoke after I'd just finished painting the ceilings.
Had the chimney sweep come out who explained that some sort of "blanket" is placed within layers of the top of the stove on many brands. These blankets tend to deteriorate and get sucked up into the flue usually blocking it completely. Has anyone ever heard of this happening???