never used a leatherman, but have had a Gerber multitool for about 5 years now, and it has taken masses of abuse, being used at home, on the bike, and out sailing.
Best of all, if you do break anything (and the smaller flatblade screwdriver has been known to shear, you can replace individual tools.
Top bit of advice I was given to stop it rusting (which in a marine environment they will) was to put it in a small oven dish, cover it with olive oil, and then stick it in the oven on max temp for 20 mins. When it comes out, using something other than your hands drop it into a sink full of cold water.
It works in the same way as blueing a pan, actually burning the oil into the surface of the metal, and is absolutely brilliant. Lubrication on all the joints, and rustproofing in one simple trick.