I have had mine for awhile, getting good results, I think it's fun, my little kids get a kick out o fit, so I'm glad I took the plunge.
I get best results when I (1) use some good-sized oak splits on top of blazing coals. Chunks were burning too fast for me to do 3 or 4 pizzas. (2)_pre-heat the stone in my oven for 30 minutes at 500 degrees, then put it on the grill. Otherwise, my dough tastes a bit undercooked. (3) I bought, from kettlepizza, their custom cut baking steel that sits above the pizza stone, directs some serious heat down to the top of the pizza. That was expensive, but very helpful
I like my pizza New Haven style - thin crust, burnt, crispy, smoky, I want my hands covered with black crumbs and soot after I eat my pizza. This set-up gets me almost there. My pizzas take about 4 minutes.
More importantly though, it's fun to watch it cook.