I had read something on the Hitchhiker forum about the premium blades which Wizard had, that they were well worth the extra cost, which, as pointed out above, wasn't much. When we put in the Wiz, I ordered a couple of boxes of those and have been using them from the start with no complaints (other than we've not really figured out the suedes yet, but we're learning on it). We probably use way too many blades because we're being conservative with it.
The Superior blades certainly sound cost-effective and we'll look into that when we get low. The original blades we got are just sitting around as kind of an emergency backup group of blades.