I highly recommend leatherman multitools, I started with the PST, went to a supertool, then the original wave and then the new wave. Leatherman is the best. The first multitool I had was a Gerber, it was OK, except the tools liked to break. It was cast and seemed rather brittle. I have broken the tip of my original wave pliers, but simply refiled a new tip and can't hardly tell its not the way it was made. I now carry a surge, its a little heavier than the wave, but I think its worth it.
As to usefulness, every time I visit my in-laws, I end up fixing things around their house. Father-in-Law isn't the least bit handy and neither is the brother-in-law, I used my wave to change out the battery in his car in the parking lot of the auto parts parking lot. He was going to pay someone to do it. The swisstool from victorinox is very well made also, but doesn't have the swappable bit driver.
Good Luck
John