I'm not sure about the hardware units... But the attach rate for software is sure to be one of the highest of all time. I don't know a single Vita onwer who owns fewer than 2 games.
I have wierd hours that I work so my Near adventures tend towards the wee hours of the morning. Even at 4am I am hitting 12-30 people in my neighborhood so I think all is well in my home town.
For games I am still slow to pick up more. ModNation is still the only chip I have and acouple of PSN games. Gonna get escape plan next prolly, and maybe little deviants.