they are ok they are not phenominal. I would only watch them for topics that you are really struggling to get a grasp of. It's basically just Fernanand drawing on a white board during most lectures. He does mention all the most valuable points of each topics but it doesn't go into too much depth other then the "must know knowledge".
If you are having a problem understanding a specific topic i would watch the video on that topic. You might be able to understand it more if you have a visual lecture to learn from.
That's basically how I used these videos. I got bootleg copies for a cheap price so they were worth it in that respect...I would never pay the full price for these videos though because they are simply just OK