Yes; I think all of her products are good. She has a ton of free fitness stuff on The Golf Channel "Health & Fitness" archives. Larry Nelson has worked with her for several years and he greatly increased his fitness and flexibility and added 20 yards to his tee shot.
The Blackburn book sucks by todays standards. Boyle's book is superior. Also, anything from Al Cosgrove, Robert dos Remedios, Cressey, Skip Bunton, etc.