PoP,
I personally carry the leatherman wave, just about every day. The knife blades are full size, and have one-hand opening ability.
I also have a leatherman mini-tool, which I wear to work a lot. It is small enough, that most people think it is a pager or cell phone.
I a;sp have a leatherman micra on my keychain, and a SOG mimitool on my jeep keys. The SOG mini has a pliars feature, while the leatherman micra has a scissors.
Out of all of them, I seem to use the micra and the wave the most.
What I like about having a multi is I can use it for crappy jobs that one would normally use a knife for, thus saving the knife for it's real purpose, which is cutting.

Leatherman has a good warranty. I broke a screwdriver blade off once, prying with it. When I returned it, they not only replaced the broken blade, but updated the other blades to current specs, ans put a new pliars head, with wire snips, on it. NO charge. That impressed me.