I would submit that Bitstamp is running a very professional operation, and that owner Nejc Kodric is very competent and not at all anonymous. They've been occasionally overwhelmed by large amounts of new clients, but all of my interactions with their support staff have been very impressive.

Through these giant waves of expansion, they've kept their trade engine running quickly (people have described a few brief periods of slower operation, but it never affected me).

A lot of folks discount them because they're in Eastern/Central Europe, but really Slovenia's business environment shares more with Germany than it does the rest of Eastern Europe.

All in all, I think Bitstamp is doing a great job.