My girls had some glow necklaces and bracelets which cracked. Also, I was afraid of the little piece that clasps the necklace closed. We threw them out as soon as the first one broke.
I did get some plastic light up/spinny mickey head pumpkins at walgreens of all places about a month ago. They've been thrown, dropped, kicked and they still work with no broken pieces.
(ETA - my girls are 2)