Not direct experience of cooking with it, but I have a friend who has one, and I have eaten some exceptional pizza off of it.
Is also easily transportable - a couple of years ago, a crowd of us took neighbouring holiday cottages, and we had his Ooni and my GMG Davy Crockett with us, and we had an excellent time of it all.
The one thing I remember is that the cooking is quite a hands on thing - the pizza needs to be rotated, as there is definitely a hot side and a cooler side. But once you know that, it isn't difficult.