I think 99% of people could benefit from him.
When we started his program, we had a HELOC (from taking an 80/20 mortgage to avoid PMI), 1 small student loan, and 1 vehicle payment. I thought - WOW, we are doing great. We have no credit card debt and only 1 car payment.
Then I realized that I could be doing SO much more. I can't remember the exact date we started.. probably a little over 1 year ago, but I will tell you that we now have NO student loans, and are 2 months away from paying off our HELOC (and it was $20k+ when we started). In August we will have our mortgage (about 25% equity in our home) and 1 car payment. THAT IS IT!! And $2K in savings for emergencies.
It really did change my life. I dont' think DR is the ONLY authority in budgeting. There are some things we don't follow to the tee (we didn't stop 401K contributions because that made me too nervous), but we are truly on our way to living like no one else. Cheesy :)
So yes, I think he is worth a read. See if your library has a copy - several of our area libraries do! Then if you don't think he is for you, no loss.