Good videos for J/70 handling. Section 3 - Tack and Gybe is put first since it is basic sailing of the boat. I am adding more videos from North Sails that I feel is good for learning how to sail the boat.
Step by step video on how to tack and gybe the J/70
Step by step video on how to set up the J/70 spinnaker
Step by step video on how to take down the J/70 spinnaker
The fleet I sail in, all the top sailers do it. It may not be as fast or fun, but in the right conditions you cannot beat the VMG. A good article on VMG can be found here: Why VMG Matters