Funny, My experience with multitools was the same until I bought a good one... the leatherman Surge is a big beefy tool with a bit kit so it can be any screwdriver, wire cutter, stripper, prybar, pliers, has decent knife blades in both plain and sheepfoot serrated. etc. Mine works hard every day, Has installed more light fixtures, than any other tool I own for the very reason of I need it alone to do that. I dunno why or what you'd do with a 810 that the LM surge couldn't do better except cut. Seriously. It also has a saw blade holder that takes standard jig saw blades, files (regular and diamond) and a very effective pair of scissors. The wire cutters blades are very hard and replaceable if you mess them up or they dull. A sheath allows the carry without affecting any of my pockets.
I wasn't being a dick... well ok I was...

because it seems crazy to me to buy a very good knife and then use it like a crappy one. Especially when for the same or less money you could have something that would really do the job and a bunch more and save you even more trips for tools.
And my experience with people who use tools all day every day is that they want the right tool for the job, it saves way more than using the wrong one because its handy... Nothing bugger up your work day like a trip the emergency room because you nearly cut your finger off using your knife like a prybar instead of a knife.... But hey its your money and your hands. Fill your boots.