Tell me if this is good; I didnt watch it yet
yeah it's good. it basically gives you ideas on what to use pistons for. I think with pistons everyone is going to start building secret rooms now to store their real loot and i bet you there are going to be a lot of traps people are going to make for fun.
A good video. As he says, it's more of a showcase than a tutorial, but it was still interesting and entertaining to watch.