These fit perfectly in my mid-centery modern fireplace.  They create a beautiful ambiance while they are on and they are quiet in the room.  I dont have to turn up the volume of the TV or music while they are on.  My only complaint is that I havent been able to figure out the dial to turn up the heat.  They cycle on and off, but I would like them to stay on a bit longer to warm up the room more.  Overall, a great purchase.