My parents have been using one for many years.
The only thing I would advise to watch out for is, how you store the bags of pellets. My parents kept them in dads shop, and mice would chew into the bags. Dad started to buy by the 1/2 ton, insted of a ton. So They can rotate the bags quickly.
A huge advantage is no more split, stack, then get a (or two) wheel barrel full of wood in the frezzing cold. Just 40-80lbs (1-2 bags) pellets would keep us warm for the day
.