The IR and F600 are strongly radiant stoves. I considered the IR long and hard for our house and nearly bought one. The reason I didn't was because of close by windows and a nearby overstuffed chair and a desire for less dramatic temperature swings throughout the burn cycle. That and our open floorplan indicated that a convective stove would be better. The T6 ended up being a good choice. It has the steady gentle heat like a soapstone stove that keeps releasing warmth long after the fire has died down. I also like that it runs nicely with a partial load of wood. If I want it to run at 500F instead of 600F it is possible by just running a partial load of fuel loaded E/W. But when you want serious heat load it N/S and give it a bit more air. It will jump up to 700F without hesitation. What I particularly like is how even the heat is in our house since switching to the T6. We never get blasted out of the living room in spite of it being of modest size. That said I really love the looks of the Isle Royale. It is a very classy stove and a strong heater. If you end up choosing it you will not be disappointed.