I own a SuperKnife and it's great. I don't sharpen knives so blade replacement is a requirement. Typically all I need is a blade to cut rope/string, open a box or score an edge w/ the tip. Superknife fills the bill perfect.
For $15 it can't be beat. For the cost I consider it well-made, they provide utility blades that are twice the thickness of regular blades. The clip is great, holds well w/o being a two-handed operation to use it.
Just a satisfied customer.