I think I now have maybe 4 of this model. I agree, they are a neat, and useful tool, much more useful to me than a second, small, blade. And, they allow for a very thin knife that can do almost everything that the Vic Explorer can do, except for the magnifying glass (a small Fresnel lens will fill that gap). This model is available with plain, half-serrated, and fully-serrated main blades BTW.
With a Wenger that doesn't have this flat Phillips driver, you can make the Can Opener into a decent Phillips driver too, see here:
http://blogericious.blogspot.com/2014/02/wenger-can-opener-and-1-and-2-phillips.html There's no real downside to this mod that I see.