Question for those in colder climates: Pellet HVAC/boilers?

Hi, everyone. I'm on the hunt for opinions. I live in a colder climate in North America with no access to natural gas. Most heat their homes with propane or oil. Mine uses a very old 30+ year old oil boiler. I've started to see more pellet boilers, but I'm a bit uncertain about them at the moment. I don't like burning fossil fuels to heat my home, but electric isn't really an option out here and it's hard to argue with the "tried and true" cast iron boiler with the BTU per gallon oil offers. On the other hand, my local government is practically throwing money and/or attractive financing at people to switch.

I'm curious if anyone out there has made the switch to some kind of pellet-fed heating system from a fossil fuel system. If so, I'd love to hear what you think of them, be it good or bad.