In one way it is a really good thing, imagine regaining hands after that trauma.
But in another way it is kind of spooky. There are many anecdotal tales of of folks being slightly "different" after receiving major organ transplants (i.e. craving foods they never ate before, knowing things they never knew before and even having memories that didn't seem to belong to them.)
Kind of like "ghost" limbs in reverse. One of my high school friends lost a leg in a motorcycle accident and he tells me it took many years to loose the sensation of the leg still being there.
Hopefully the new hands work out well for this guy.
Dave