Just looking for experience / opinions on the Harman Magnafire Elite. This is the coal burning fireplace insert. Yes some would talk about using wood or other fuel instead but that is not what I'm looking for. Just coal burning insert. Preferably some owners of these units. Looking for pros and cons. Also waht size have you found them to work best with Nut, stove etc. I already looked at the thread on the Elite vs the Hitzer. Also have most used the 7"oval pipe or chaged over to other size?