Dave elicits the "love-him-or-hate-him" reaction from the majority of people - a good thing if you ask me. I like him, but have my disagreements with a few of his philosophical points, but his basic principles are spot on. And he has the testimony of thousands of students to prove it.
I used to catch him when I was still in my 20s on my commute home. He put a lot of good ideas into my head. I was never really the type who was keen on debt but I think listening to him helped cement the idea that debt was bad even further in my mind. I haven’t heard him in years though. A good friend of mine used his envelope system and got themselves out of debt and have been cash only people for quite a few years now.