Absolutely LOVE this insert!  It was purchased to place in our wood burning fireplace at camp as a quick heat source for cooler days in the spring/fall.  It fit quickly and easily into the firebox (after I vacuumed and wiped down the firebox).  I tuck the power cord inside the firebox when not in use, then simply open the doors and plug it in when we need it.  The electric flame is realistic and adds a nice ambiance.  The heat comes from the top of the unit which means its not obstructed by the frame of the firebox.  It does an adequate job of heating up the "great room" which measures about 16"x20'. I close the doors to adjoining rooms and even in 50 degree outside temperatures the chill is out of the room in about an hour.  It's let us extend our season at camp.  I would definitely recommend it!