Videos can be very useful, but it really depends on how the content is delivered. I've seen videos where they simply show the form and say "good luck", and I've seen videos where they go over every section of the form, pointers for proper technique, practical applications, and the teacher even providing an accompanying script to study.
Master Tat Mau Wong had a very complete package, which included booklets, historical stories, basic Cantonese lessons, audio tapes, and videos which taught both technique and forms, all providing direction on proper execution. Heck, he even had a "bloopers" reel at the end, to show us that even the best make mistakes. It WAS a bit pricey, though, costing around $120 per package. Unfortunately, I hear this was discontinued.
The weakest of all weak things is a virtue that has not been tested in the fire.
~ Mark Twain
Everyone has a plan until they’ve been hit.
~ Joe Lewis
A warrior may choose pacifism; others are condemned to it.
~ Author unknown
"You don't feel lonely.Because you have a lively monkey"
"Ninja can HURT the Spartan, but the Spartan can KILL the Ninja"