Haven't been able to play as much as most people (got the game a few days late and my work schedule is hell), but I've managed to S-rank with Ritsuko and I've got a good chunk of the costumes and accessories unlocked. Holy heck is this game leaps and bounds better than PS. Like I'm having just as much fun with it as I did OFA, though I will say the lack of commus does sadden me a little as well (even with my horrible, horrible Japanese I still enjoy them).
And Shika holy heck what a cutiepie, protect this little dear (ha) at all costs. Even though I know it won't be likely given her deal (jerk friend accidentally spoiled me on her plot stuff before I even got the game), I find her so sweet and endearing and I'd really like to see her in a future game.
Honestly I'm kind of waiting on the six major lives for the time being, wanna rank a few more of the girls up (since I focused almost entirely on Ritsuko... oops.) and clear most of the other listed lives first (probably a horrible way to go about things, but I like completion to be relatively orderly and follow some semblance of a sequence).
Kudos and thanks on that event list though, that'll seriously come in handy when I decide to take on some of the other more time-sensitive lives.
EDIT: I will say though once again, I wish the rhythm game was a little more difficult. Like it's largely not the point of iM@S, but being used to Project Diva's rhythm game On Extreme, MASTER difficulty feels stupidly easy. Like unlike PS I actually have fun playing some of the songs, but still... if you're going to make the actual Live gameplay that of a traditional rhythm game, seems like you'd put a little more time into making it somewhat challenging seeing as it's going to be a big chunk of gameplay.