As far as strategy goes 99% percent of the stuff out there is useless junk which simply will not work no matter how effective your money management & how disciplined you are, so personally I disregard all vendors, system sellers, gurus who do not provide an audited trading statement, in my time I've just seen three who've done this
-Mark Larson had a handout of his trading results
-Chick Goslin had it on his website
- John Grady, when he first started out he had uploaded his tax returns for 650k (I saw it myself but it could have been income from a source other than trading .... so not completely sure)
If anyone has personally seen others I'd be interested to know
Some exceptions to the above rule would be
- Mark Fisher of The Logical Trader because hes a well known pit trader
- The Market Wizards because none were interviewed without Jack Schwager verifying their brokerage statements
- Possibly Andrea Unger because of his publicly available track record
- Possibly Kevin Davey because of his publicly available track record
- Possibly Steven Dux as reviewed by Emmett Moore (but I'm not certain as Moore himself has a shady past)