we love ours.
Our living room was cold. We had some buikding work done to insultae the long North facing outside wall, and at the same time put in a wood burner. We did also change the radiator.
The room went from freezing to warm. I would say though that while it is LOVELY with the fire on, it is important that it is warm without if we want it to be, so that I dno't have to light the fire.
Fire is on most weekends.
hard to say how much exactly to install as some was done by builders, and some by specialist. About £2,000 including cost of burner. Ours is a multi fuel, so you can burn coal or wood, but we always burn wood. You need to check your local by=laws, if you are in an area covered by 1952 clean air act, then technically you shouldn't have one. That doesn't seem to have stopped half of London, but strictly many wood burners are illegal if they burn wood.
Wood isn't cheap. We have a large garden with a wood store by the house and a massive wood pile at the end. The pile (actually it is fairly well organised) is of wood from trees. We ask nieghbours and friends to let us have any wood from trees they have trimmed etc (NOT pine trees though) and we store it for 2 years. You can't burn new wood, it must dry out. Store it under cover for 2 years.
We also skip dive pallets and fence posts and off cuts of wood. Very careful to only get pieces with no paint/stain/creosote on.
We've had ours about 6 years and never bought wood (dh has bit of a thing about only using recycled wood) It takes a fair but of work to cut it and saw it and store it. You need an electric saw.
cleaning - empty ash tray about once a month. It does make the room a bit dusty, but not bad.