If by "to completion", you mean I've S ranked every song on every difficulty aside from Hard Rock, then yes, I've played it to completion.
For those that like EBA, you should get Ouendan and Ouendan 2 for it. It doesn't really matter if you don't understand what they're saying, since the whole game and the stories are pretty self-explanatory. You just have to get them. Import. Import. Different songs, different beat layouts and everything. Maybe obvious to people who already have the games, but to some it isn't.
For those that like EBA, you should get Ouendan and Ouendan 2 for it. It doesn't really matter if you don't understand what they're saying, since the whole game and the stories are pretty self-explanatory. You just have to get them. Import. Import. Different songs, different beat layouts and everything. Maybe obvious to people who already have the games, but to some it isn't.