It seems pretty good quality and my son loves it. It should be a perfect size to still be a carry-on for the plane but bigger than most kid's luggage. I haven't yet used it, so this is just based on initial observations.
Update: We've used it once on a plane trip & about 4 times with gentle car travel. The lock jammed up, & we couldn't open it, so we had to break it off completely to get it open. Then the one zipper broke. So, even though the size it good, it's cute & outer shell seem good, I probably wouldn't buy it again because of the lock & zipper issue.