In the past I have ordered a 100 pack of sheet protectors (in store) and had a great experience. However my recent online order was not as great. The sheets came wavy instead of perfectly straight which impacts how they lay in a binder. Although they still work I was less than impressed especially given the cost.
I use the sheet protectors for presentations.. I can keep the pages in order for each occasion. It's much easier than punching holes in the paper. And of course they are protected well