I really liked having Miku (#3903) as a keychain, but it had the big flaw that it was only printed on one side. Which doesn't work that well when it's on your bag and always does its own thing there and hides itself.

Which is why I got this keychain, since it not only looks nice and cute, but it's also printed on both sides!

(Also I don't think it's a acrylic keychain, since it feels more acrylic? And you can also feel the print with your finger, which is nice.)