I just needed to break down a bunch of boxes so I bought on price, and I expected to get something cheap. Instead, I got a really sturdy knife with some pretty cool features:
* The grip is really comfortable, even for a large hand.
* It has an extra bend and section to put about an inch between your pointer finger and the blade - no accidents or raking knuckles on the object being cut.
* It comes with a total of five blades, each double-ended for ten total.
* Changing the blade is push-button easy. One button releases the blade. Another opens a swing-out tray with the spare blades contained in the handle.
* The blades really last. I broke down a few hundred boxes and didn't need to cycle through. I can't see needing to buy more blades before I lose the thing.
* There's a raised numb on the back that tells exactly the right place to rest your thumb. You can get a good, safe grip without having to look at the thing.
I'm very happy. This is better than the last couple units I bought locally at $12 and $15.