buying a binding machine

So I'm going to buy a binding machine for preparing nice professional copies of my scores. Unless I buy a ridiculously expensive model, it should pay for itself pretty quickly since I won't have to pay Staples or Copy Cop to do the binding. Plus, I'll be able to make the scores when I need them, one at a time, which will be much more convenient than making time to go to copy places.
This model is the one that I'm thinking of getting. It's well within my budget ($300 or less) and seems to have the features I think I need.
Advice? Opinions?