Great knives are a joy to use; there is nothing worse than a lousy, non-sharp (it can be non-sharp without being blunt) knife when you're cooking. The frustration can be killing.
Another point I'd add, which might be tricky if they're a gift, is how they feel in the hand. I've got reasonably small hands so I don't like knives that are too heavy or where the handles are very bulky - similarly, I like the 8" rather than the 10" cooks knife since I find it better to manipulate. I've got a few Global knives with their sharpener which have lasted me a few years now and with regular sharpening stay in pretty good nick. But I'm fussy and don't let anyone else near them!
Another point I'd add, which might be tricky if they're a gift, is how they feel in the hand. I've got reasonably small hands so I don't like knives that are too heavy or where the handles are very bulky - similarly, I like the 8" rather than the 10" cooks knife since I find it better to manipulate. I've got a few Global knives with their sharpener which have lasted me a few years now and with regular sharpening stay in pretty good nick. But I'm fussy and don't let anyone else near them!