I don't think there's going to be any more input lag than you get with the Wii U pad (which is pretty non existent)
but yes, it will be great for longer grindy games.
I'm still hopeful for PSO2 in 2014. At least the PC version is MIA here too (while they focus on the Korean release was it?) rather than it just being the Vita version. And Sega have confirmed that Diva game and have Football Manager (cross save with PC/Mac don't forget :D) coming to Vita next year so the format definitely hasn't been abandoned by them yet.
I was talking to someone at work today and realised just how excited I am for Borderlands 2, I think it's the perfect format for it. If it had cross save with PS3 or even PC that would be even better.













