I'm a fairly fanatical Codecademy user, so this is not news to me: I've been testing these courses since at least two weeks :)

Unfortunately this means I'm having all sorts of data integrity issues: for example, I can't access the third lesson in the Parse track, which is showing 9/4 exercises done. I'm also having trouble finishing several exercises in these courses, due to puzzling errors and, possibly, flawed tests.

But, wrinkles aside, I think these lectures are a brilliant way to generate leads: I subscribed to pretty much every service that has course on its API (Parse, Twilio, NPR...).