Original made in USA Leatherman, plier tip broke off on second time use, while bending some home electric wire, just making a loop. Screwdriver twisted when trying to remove a screw from a wooden 2x4.
Supertool wirecutter would not cut a coat hanger, edge damaged from attempting to make that cut. Plier jaws twisted also and became loose. Cutting tools dulled easily and were soft metal.
Second Supertool was sent to a friend in the military in Iraq, sent me a letter a few weeks after recieving the ST and thanked me, said it was very handy but could I please send another because the first one broke. Unspecified breakage. I sent him a Swiss Tool, still has it today and uses it daily at oil rig job in Oklahoma.
Micro, scissors were useless after cutting some moleskin to treat a blister. Again, soft metal. Knife blade damaged while using to pop off a cheap watch back, yeah, I know not recommended!
I am sure Leatherman would have warranty repaired or replaced any of these. I never sent them in. Reason: why would I want another tool that would fail?
A warranty is great but if the tool fails you when you need it most, in an emergency, what good is a warranty? If you die because your equipment fails, a lifetime warranty just expired.