The brake booster video is excellent and pitched by a subject matter expert. Until you watch it you'll never be aware of the subtle differences between boosters. The unit arrived ahead of schedule and seems to be of good quality. The only problem I have to mention is the fact that, unlike the boosters advertised or used as examples in the video, mine was not painted. Hindsight being 20/20, it's probably for the better since you can see and appreciate that the unit has indeed been totally rebuilt and not just an "Aerosol Overhaul" product.