This DVD emphasises the difference between declaring/defending 1NT and 3NT (beyond the obvious of needing fewer tricks) and the frequency of a bidding sequence of 1NT opening followed by three passes. As in previous DVDs it is in two parts, the first covering the play and the second defence.
A new concept for your reviewer was the idea of "two suits". Basically this is saying that whether in playing or defending, you are unlikely to obtain the number of tricks you require in one suit, and therefore should be looking to get them from two suits.
Overall well-structured and most people will follow and benefit from viewing this DVD.