I was worried it was going to be just a novelty experience, but these kones are good!
I had the completo, which is like a supreme or all-dressed pizza (as you would call it here) and it was good. It was very hot and full of toppings - I had expected it to be more of a gimmick meal, but I was pretty satisfied with it. I got the trio which was less than $10 and included a drink (they've got a good selection of drinks, not just the normal Pepsi, etc) and a dessert kone. The dessert kone is where it's at.
I had the classic dessert kone, which was OK (it comes with chocolate and custard) but my girlfriend got the chocolate one which was FULL of Nutella - I would definitely get this next time.
I went around 12pm on a Thursday and there wasn't too many people there, so we got served pretty quickly which was good.