I've watched both videos and have attended Rick's class.
MBB III is the closest thing to actually being in a class, given the great amount of detail presented. MBB III is accomodating to a variety of shooting styles, aiming at getting the best out of whatever style you're using, rather than changing your style. If you do change things after watching MBB III, it's because you learn to analyze what you're doing and initiate the changes yourself. I learned a lot from watching MBB III and will probably watch it again. MBB III is accomodating to both gap and instinctive shooting.
Rick has developed a deadly accurate style of archery that has won him many tournaments and killed a lot of game. Rick has never accepted anything in the archery world without questioning and testing it, and is quite willing to throw out anything that doesn't work for him, even if it means stepping on the toes of the establishment. His goal is to make the act of shooting an arrow as simple as it can be, eliminating all movements and postures that don't contribute to delivering the arrow accurately on target. He teaches his method. Period. If you love your shooting style, and are not willing to change things, you probably won't like Rick's videos and class. If you search this forum, you will find quite a few discussions about Rick's style from people who couldn't completely understand it from his videos. Rick has a couple of new things in the pipeline that should help clarify his style. Rick's students are generally amazed at how much their shooting improves from a day and a half of his instruction, but it would be a little harder to get that level of improvement from watching his first two videos. Rick teaches instinctive shooting only.