Jotul is thought down here to be the best, although there are far cheaper units available Jotul is the one to have. We had a little Jotul 3 which burned seasoned oak down to a fine white ash- no ash tray and it didn't fill up over a whole day. Woodburners are much cheaper than oil heating or electric to buy and run, but as said they have inherent problems. I've had CO poisoning twice, first from a fire in a rental which wasn't in serviceable condition, second from knocking the fire and disconnecting the flue slightly. You must open a window before opening the fire, otherwise CO is drawn into the building. The government advises people to open all the house doors and windows for 12 minutes every day to flush out accumulating CO. People sweep the flue once or twice a year using very inexpensive kits sold in the hardware stores and take dated photos to prove to the insurance that it had been done, otherwise they won't pay out on a fire claim. But the frequency will depend on how well seasoned and dry your wood is and that takes some management, even down here. There is a lot of work involved in cutting, splitting, stacking and moving wood and it needs a lot of storage space as well as seasoning can take two years.
I prefer the oil central heating and use the woodburner just for a few hours in an evening at either side of the heating season. We burn briquettes as they occupy a quarter of the storage space of the equivalent wood. But keeping them dry is another problem as they readily absorb moisture and disintegrate.