My experience with an OHT was that the Philips screwdriver isn't that strong. The screw I was using managed to eat into the screwdriver slightly when I was screwing it into some chipboard. The same task using a Leatherman screw bit didn't hurt the bit at all.
That's actually pretty acceptable to me for a SAK, you can't expect Victorinox to use one kind of steel for the knife and saws and then switch to a harder one for the screwdriver--after all, it's not specifically meant for the urban environment. But I'm wondering, since the SwissTool is meant for these kinds of fixing, assembling jobs, does Victorinox use harder steel on its SwissTools than for SAKs?