Infinite Jiu-jitsu 1: ディフェンス パワー ドリル DVD by カルロス マチャド

The stuff he teaches is useful and effective. Also it's good for me because this part of my game is a major weakness-I never was effective in this open guard stuff. However, the instruction is boring to tears. I had to turn it off after about twenty minutes.

Twenty stars out of five!!! One of the best if not the best BJJ instructional I've seen. Carlos's a living statement about the technical proficiency of his family and when it comes to explain and demonstrate the subtleties of the techniques you can clearly see he's a very gifted player. A bit pricey though, but if you can afford to buy it, you won't regret it. Highly recommended.