The only suggestion I would have is breaking the videos down into sections, and providing links to each section in the description for each "chapter" that you have at time breakpoints. Makes it far easier to navigate. Clicking the slide bar isn't incredibly inconvenient itself either. Probably just personal preference on my end.
I've begun testing of the crit/haste build with GoSup in preparation for 5.2 just to see where it falls. It's a bit quicker and seems to be less reliant on proc management to empower CB's, since you throw around quite a few more of them. Might warrant a new set of videos, or at least a mastery build disclaimer. May not pan out to be better, or even equal, but I like to be prepared. Illidan still mocks me when I sleep