The big difference between the Essentials and Intro to Tech DVDs is that the Essentials one was the first one they did. Therefore, it doesn't have a musical background, and it doesn't have the same grease pencil/voiceover format. However, there are things on the Essentials DVD that are not on the Intro to Tech, that are good for more novice divers.
I believe it's possible that new DVDs will be forthcoming from UTD shortly -- they spent a bunch of time reshooting things at the instructor symposium on Catalina this fall.
I believe it's possible that new DVDs will be forthcoming from UTD shortly -- they spent a bunch of time reshooting things at the instructor symposium on Catalina this fall.