Came to Bonanno's upon arriving in Las Vegas after a long flight delay, hungry for a late night snack. I had a slice of gourmet veggie pizza (gotta get my 5 a day somehow!). It cost $6.49 plus tax, which I guess is cheap for the strip but was otherwise the most expensive slice of pizza I have ever had. It was okay. Shortly after eating my pizza, I moved on to Bally's and found a place that sells $2 tacos and margaritas - a much better deal, in my opinion.
While I can't speak for the other menu items, I can't help but feel there are just better options elsewhere on the Las Vegas strip, even in the middle of the night. That said, if you really want a slice of pizza and you're on the go, this is the place. The pizza (fold-worthy, NY style) comes in big slices and has decent crust, fresh-tasting simple sauce (not over-seasoned) and a fair amount of toppings.