My parents have bought it for DS aged 7. I've just been told by a friend its a PG not a U and is quite scarey in places.
DS is very sensitive to these things, cries at the time and has trouble settling a night and wakes up in the night crying etc. He got upset at Toy Story 3 amongst others.
AIBU to tell parents that they'll have to take it back and swap it, which they won't unless I put my foot down and say its a PG and as a parent I'm putting my foot down.