If you want to buy a pellet stove, make sure that what you purchase is of good quality. Regardless if you buy used pellet stoves or new ones, it is very important that you know that a good pellet stove runs very well, it throws lots of heat, and it does not need too much cleaning. Unfortunately, if you are buying used pellet stoves, and thus a cheaper stove, you will probably not going to get the best item there is.
Usually, pellet stoves are more convenient, safer and cleaner than other burning systems, such as wood stoves. But, on the other hand, the stove pellets have a complex constitution that requires more expensive components that can break down, and they run only when there exists an energy supplier to feed it.