I read a review of that when it first came out .. reviewer wasn't impressed. Apparently it's very soft metal, the screwdrivers were useless.
I think that if you were to call the screwdrivers useless, it would be because of the impossibly short handles, or the fact that they're so wide they won't fit in much, or the weird down angle they have to keep them from snagging.
I'm not sure how you'd manage to damage the screwdriver without holding the link in vise-grips, as you can only really hold them with fingertip pressure.
The links are an unusual cast stainless, but it seems that Leatherman did a nice job on the casting. However, I can also see how any cast stainless would be soft for tool use, but again, it's not like you can apply any real torque to these.