Let’s face it, spey and switch fly lines are not the easiest things in the world to figure out. Almost everyone I know has questions, myself included. There are tons of different styles, weights, lengths, etc. and matching them to a specific rod can be challenging at best.
The movie here, while obviously produced by RIO does an excellent job of demystifying spey and switch lines for people who have questions about them. It’s actually the best one I’ve ever seen. Simon Gawesworth is probably one of if not the most qualified in the world to answer these questions and explain the differences in these types of lines.
Enjoy the movie and hopefully it helps you out if you have questions about spey and switch rods.