I have 3 multi tools, a Kershaw that has locking pliers, a Leatherman Wave and a new Leatherman Titanium wave, they have a lot of add on you can buy, albeit very expensive unless you buy them over the net.
The Leathermans are very good, but the Kershaw is better IMO, mainly because of the locking pliers, no many accessories if any, but still a very good multi tool.
Baz.