Well, it's easy to say it's the best version of the song I've heard, but at the same time, it's also the worst JAM Project song I've heard. JAM Project does better with the hot-blooded mecha type songs and stuff like that. They actually sound like a real band and not just a seiyuu type band. But when they do a cover on a pop-like song like this, I have no comment. Out of all anime songs they decide to cover, they choose this? They could do better than that.

Motteke! Sailor Fuku: http://youtube.com/watch?v=cT5EXCw2KSU
A normal JAM Project song: http://youtube.com/watch?v=RGEN60bf3p8