Roy Dean is an amazing jiu jitsu practitioner and instructor, straight up. His method for explaining moves are VERY clear and concise, and I highly recommend this as well as his other items like the Blue Belt and Purple Belt videos.
The criticism I have is that the iphone app is just a simple port of the videos to the iphone with no consideration given to the form factor and user experience on a small screen.
There's a huge opportunity on the iOS devices to really think out of the box and do something innovative, and I hope to see this app turn into something more eventually, but as a convenient way to watch RD's videos, I cant complain at all.
One other thing is that with the smaller screen, I think the videos need to be changed (dare I say.. re shot?) in some instances to provide close ups, especially when dealing with the small movements required for wrist locks.
Overall, this is great value, and I recommend it.