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Has anyone else looked into the Great Courses videos?  I have gotten a number of them concerning both paleontology, geology, evolution, earth history, etc.  I have found them to be quite interesting.  They aren’t cheap but if you aren’t in a hurry, the title you want will go on sale for a substantial discount. My only complaint is that they are heavy on lecture with a well qualified professor presenting the material but short on visual aides.  I could do with more slides or images supporting what is being discussed with less face time of the presenter.  I’d like to see him more as a narrator/lecturer.  Anyone else have experience with these videos?