I finally broke down and got one of these after getting fed up at dragging my knuckles through the pizza with my old, small wheel cutter. Boy am I glad I did! This cutter works sooo much better. I don't know if it's sharper, or if it's because it has more heft, but it cuts right through those pizza crusts, like a charm.  I have also used it to cut pastry and dough and it works really well at that, too. Finally, it cleans up quickly easily. Definitely a great gadget every kitchen should have.