unlike Mt. Gox you just do not know who is behind it.
On the contrary, I met several of the Bitstamp guys, including CEO Nejc Kodric, at the San Jose conference. I'm not at all worried about them running off with my money. The only concern I would have is the same as I have with any bitcoin exchange; namely, that some ignorant government somewhere freezes the funds.
Its OhShei8e spreading lies over and over again. The Bitstamp guys are pretty well known, and are much more visible than Gox's wonderfully transparent CEO karpeles.