This is my first post although I have been reading alot these past few weeks. I am about to purchase a wood stove and it is down to two choices, both Jotuls. The 500 Oslo or the 600 Firelight. I have the 400 Castine in a downstairs family room and love it, hence the desire for another Jotul. Anyway my upstairs is a sort of open floor plan with the living room, dining room and kitchen together in a loose L format. The living room is 25x30 with 25 foot high ceilings, the dining room area is 10x12 and the kitchen area is 12x17. Around the back of the living room and down a hall are bedrooms. The house is an A frame. Pretty but a nightmare to heat. It is always much colder on that side of the house. I put 2 ceiling fans in but it helped very little. I am about to purchase a stove and was set to buy the 600 when the store owner thought the 500 would be better and more user friendly, especially with the single door. (It is going in the fireplace as opposed to an insert). I felt that my rooms are so large and the ceilings in the LR so high that I needed more of a "monster" stove to heat it. He felt the difference wasn't significant between the two. Yet the firebox on the 600 looked much bigger and is about 2 inches wider and 4 inches deeper. I also felt I could get a longer burn time from the bigger unit. I have the 400 in the small room and have a hard time believing that the 500 is big enough for the upstairs area although it is easier to use and cheaper, therefore very tempting. I am leaning towards my original intent but was wondering if anyone had any thoughts or could comment on these stoves.