Lance,
I think that TRUST is a key factor in following advice from any mentor whether online or face to face, payed for or free.
I am also subscribing to Terry Dean's Monthly Mentor Club and Internship program. A positive opinion that I have is his background in the Internet Marketing world and current content is credible as well as timely and informative, just look at his blog,
Internet Business Coaching by Terry Dean. He doesn't promise hype and requires hard work and followthrough. I trust his advice. Should you? That's up to you.
The only negative opinion I have is with free coaching services you'll get no feedback, but great direction. In his Intern program you must be willing to put the time into the assignments and follow through on a timely basis.
If you're willing to pay for his coaching services you will get direct feedback from him by email or if you're willing to pay a little more for email communication and phone consultation. But you must have specific goals or you'll waste your time and money.
I can't tell you that I have reached my goals yet but I feel more confident daily as I work through Terry Dean's mentoring program that by mid August I plan to reach my goal of driving quality traffic to a well constructed website that provides unique ebook products.
I hope this helps. With warm regards.
Ken