Sex advice DvD's

I'm not normally one to turn to videos and help for advice bust with todays new addition I have been tempted. Today a tantric sex DvD surfaced, this is a grey area for some people and an area I wish to explore more. I've looked into areas of tantric before and some books aren't actually about the life style or act but more of personal opinion. http://www.lovehoney.co.uk/product.cfm?p=21311

For someone who has never used a self-help, tips, or fact sex video; I am wondering what it is like.

Do people find these better than books?

Do they offer advice like promised rather than just being a sleezy video?

are they filmed correctly?

There are many points I wonder about these types of DvD's, some are similar to my doubts in certain written texts and spoke advice as well.

What are your experiences?