EDIT: YES, I MEANT DEVIL SURVIVOR. I'm ashamed, I should be hanged 
So, I have given this game some 2-3 hours of play, and I have to say it's quite engaging (as expected, if I might add). The story is like a more lighthearted version of Nocturne (world gone nuts in the first minute of the game, but with some character interactions Persona-like), and it's got me quite hooked up, I like the contemporary setting. I'm really liking Atsuro as character, not so much Yuzu but I can stand her. And the COMPs getting emails (something like the .hack series) works great too
As for the gameplay, it's pretty original, since it plays like a standard SRPG but when you attack an enemy or get attacked it switches to a regular SMT with weaknesses and extra turns. It plays mostly like you'd expect (Dia, Agi, Zio and all that), so if you played any SMT you'd feel right at home
Overall, I think so far the game's really great, it looks that Atlus did it yet once again. Has anyone else been able to try it, and what do you think of it?
