According to this website [http://www.engadget.com/2012/02/28/sony-updates-ps-vita-sales-figures-over-1-2-million-units-worl/], 1.2 mil units (world wide) and 2 mil of software. (As of Feb. 26th, so it should be a little bit higher now)
Though, I don't know if this is good or bad. I'm going to guess and go with...good.