I purchased the MEDICUS Dual-Hinged Driver Training Club in May, and did it after a lot of web surfing. AMAZON had it at the best price, NEW, and with the DVDs (which were very helpful). I think it is one of the best golf purchases I have made, after taking up the sport a few years ago. Some instruction is non-verbal, and the Medicus lets you know clearly when your swing is wrong. The primary benefit from me was that it taught me how to "wind up," and pace my swing, so as to get peak power and speed at point of impact. I am VERY glad I bought it!
5 stars

When I purchased this item through Amazon (April 2006), the manufacturer was offering a couple of training DVDs. I ordered through one of Amazon's partners, however (a big one in Austin, TX), and did not receive even a pamphlet with instructions on how to use this club, much less any DVDs. A company rep promised to send the DVDs, but they never came, so we returned the driver today and will order one for the same price directly from the manufacturer and get all the extras. 5 stars