I do like the aesthetics of the viz (reminds me of some of the charts the New York Times produces), but some of the interactivity seems broken (i.e. when I double-click a bubble I get a Tableau error message and then the spinny of death).
The site mentions the NYTimes often, so I assume they were modeling their work after theirs in some way. I didn't notice any interactivity issues, but its possible its an older viz.
I had never posted anything in Viz Talk before, so I just thought I'd throw something I liked out there!