Ordered the "free" book. Paid the $7.95 shipping. That's probably about what the P. O. would charge for shipping. Learned some things from the book, but there is an awful lot of "buy this, buy that" in the book. Don't really know if any of it would be truly useful. Sounds good, but - - - I suffer from quite severe sciatica pain hip to foot. Have spent over $1000 through standard medical approach, including chiropractor, with little relief. So I decided to give one of their products a whirl. Ordered 4 bottles of their RUBON RELIEF ($79.90). Have used 3 of the 4 trying to determine if there is any benefit. Opinion - Snake Oil. If I receive any relief at all from this stuff, it is not at all apparent to me. To top it off the bottles come with plungers which are supposed to dispense the cream, but do not work at all. So much for quality.