I bought a LM Core about 2 years ago. Great tool and came to like it a lot. I posted about this in the multitool.org forums so I'll just paste it here:
"It's pains me to write this. It's been only 4 months but after much use, only two drops to the ground, and plenty of simple admiring, my Core has gained a battle scar. (Sorry, pics no longer available)
It's hard to get a good shot of it because my camera seems to not want to focus close enough. I tried colorizing and circling the crack to make it more apparent. The hairline crack is invisible when the tool is closed, pliers in their normal closed position. When the Core is fully opened with the pliers out the crack is then visible. It's right at the end/edge of a handle and is, per the Core's ruler, 0.5cm long. I carefully inspected the rest of the handles and cannot find any other problems. I have no clue when, or how it developed, but I -am- bummed. I guess Leatherman will be getting a warranty call from me." I returned the Core to Ace Hardware and they replaced it with a new one. I ended up giving it away to a friend as a housewarming gift. I was broke at the time and figured it was a good gift. I know it was because he still uses it. I had bought a Victorinox Spirit and loved it except the handles were a little slippery and the Phillips driver wasn't as good as the Leatherman. I would buy the new Vic Spirit model if I needed a multi now.