Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is this mortgage advice good, or is it hooey?
Jack "The Mortgage Professor" Guttentag provides a thorough analysis of a similar-sounding system: In addition, I had the feeling that customers of Mortgage Relief should have gotten a spreadsheet for their $45, and wondered why they hadn’t? So I set out to develop a spreadsheet of my own that could quantify the benefits – if there were any. The major question I wanted the spreadsheet to answer was, how large is the benefit of using the Mortgage Relief scheme if you don’t have any surplus income but only just enough to make the scheduled payment? This is the critical question because we know that if you use surplus income to make extra payments to principal, you pay down the mortgage more quickly. This is so whether you apply the income directly to the mortgage, as most borrowers do, or whether you follow the Mortgage Relief procedure where you use a credit line to pay down the mortgage and current income to pay down the credit line. I spent much of my air time between Philadelphia and San Francisco on this project, and finally gave it up. Once I removed surplus income from the equation, I could not find a way to make the Mortgage Relief scheme work. You may also want to read related articles by Guttentag: