This is one of those ingredients that really pays off when you use a higher quality. If you have a very inexpensive balsamic vinegar you may need to reduce the cherry and balsamic glaze for longer to achieve the correct consistency.
To make paleo, sub ricotta for dairy-free version and omit parmesan cheese. Add 1/2 teaspoon salt to dairy-free ricotta mixture.
This serves 2, go ahead and double to make two pizzas to feed 4.