Are these worth buying on Blu? (quality wise. I've already seen the movies)

Quality-wise, sure. If you like them, they can be had for about $11-15 each through various sales. Didn't see it as much of a gamble since I liked both of them. But both have excellent picture and audio quality. The second movie even has an option where you can "choose" which direction you want them to go. You can choose for them to not go after Maria and it takes you to a half hour alternate "movie". It's odd, but funny.

If u liked them, them absolutely! Excellent picture quality. Plus they are only $10 @ best buy this week... cant go wrong there.