The translations aren't perfect, but it beats doing it on your own or trying to dig up scattered fan translations from the fairly dramatic community online.
The songs slap, of course, and the rich 3D graphics are still great. I have literally no issues on my handset.
You can get dia by reading stories and doing events, though I find the monthly pass to really be worth it.
Don't put any stock in the embarrassing hipsters who try to tell you the JP, etc. version is better. It's the same dang game. The main reason to keep playing our other servers is to play the newer events. That's it.