I have used the great courses for the past 12 years I believe and those courses nearly got me my scholarship, helped with my symposium, they were just amazing. The trick is to find the right professors though.

Bluebird wants to try them I recommend bit torrenting them for free and I can tell you which professors were the best in my opinion.

I've taken philosophy courses, history courses, psychology, science, nutrition, classical literature, and poetry. Not all professors on the great courses are great, but the few that are good, they are amazing.