My buddy Bola Bola has one of these ovens, he received as a gift. It is a little on the hot side, and is a lot of work to keep at constant temp. The opening was rather small and made for a bit difficulty to turn a nice nice pie. He started using some very small oak I had chopped him from my property which probably worked better, but I think he has gone away from it at now uses Willards 2stone on his Webber.
Perhaps he will chime in.