Golf Swing trainers to eliminate shanking golf balls?

I have tried the Inside Approach and other training devices, but would like to know if anyone has found, used and had great success with a product that really focuses on making more solid contact with a golf ball and helps improve long iron play. I sometimes shank balls, especially with long irons. Please help! Thanks!

save your money, dont spend it on any “magic” product because they dont exist. Spend the money on some lessons where a professional can look at your swing and tell you what you are doing wrong.