I don’t offer reviews very often but I write the following with no intention toward hyperbole. 2 years ago I began to reconstruct my 40 year old golf swing. Mobile videos were instrumental in confirming my swing changes were correct. The ability to markup a swing video was essential to measuring correctness. This relatively inexpensive subscription gave me all the tools I needed. I capture videos with my iPhone edit out the non swing activity with iMovie and then upload the shortened video using the import feature. I’ve tried other similar apps but once I used this one I new I had all I needed.