I carry one myself. While I don't use it every day, it comes to hand often enough to make it worthwhile, either pliers or the screwdrivers. Because it's so small, I carry it no matter what I'm wearing: cargo pants, dress slacks, suit. I have a couple of leatherman-type tools, and I don't carry them, as they are too bulky and have too many tools I don't use.

A pocket knife and that little plier/screw driver set fit my needs perfectly -- extremely portable, not bulky, fit in my pockets with no unsightly bulge. :-) Sometimes less is more.