The education market provides 3 main things: actual teaching, a social network, and credentials/social proof. Its great to see the actual teaching being tackled, and it will be interesting to see if they find a way to let students shine on the credential side. They say they will offer a certificate, but this certificate being difficult to obtain and highly indicative to mastery will be what make this offering a true alternatives to expensive colleges. Right now the best credential that I can think of that is relatively inexpensive, not tied to schooling, and highly regarded is the CFA.