From what I can find, it contains 'dough relaxers' so you can shape the dough without it springing back. It also claims you don't need to let it rise, but it then tells you to bake your pizza for 30 minutes! So it essentially rises in the oven.
Compare this to 'proper' dough which you let rise for a couple of hours, pull into shape and then bake in a screaming hot oven for 5 minutes tops. It strikes me that using pizza yeast is 'pizza for dummies'; claiming 'it stops it rising too much' is nonsense because if the amount of yeast is correct in your recipe you control the rise anyway.
So it depends on whether you like doing things easy or doing things right. You can bet your pepperoni slices they don't use 'pizza yeast' in Naples. Personally I cheat just a little and use dried fast-action yeast as it has a longer shelf-life and you don't fuss around proving it, and my pizzas come out great.