MMA's have been around for a while. If you have a HELOC, it's a smart way to use it. Spend a little time on google, and you will find that the skeptics speak more prolific than the proponents. That should tell you something.

Most of the companies selling MMA's are multi-level marketing firms, that charge heavily ($3500+) for their "proprietary" software.

You can also find free downloads, done by smarter mathematicians than I, which can give you similar results. If you put that $3500+ as a principal-only payment on your mortgage, you will be that much ahead of the game.

The interest rate on HELOC's are variable and are usually higher than a fixed rate conventional mortgage. So you'd be using more expensive debt to pay off less expensive debt.

It may also not be in your best interest to pay off your mortgage early. If you have a low interest mortgage, sometimes you're better off investing the extra money instead.

Finally, most things sold by multi-level marketing are vastly overpriced because everyone in the entire hierarchy gets a commission on every sale.

I agree with merj, use the $3,500 to pay down principle. You can also refi to a shorter term loan or just send in extra principle payments. You'd be amazed by how much interest you save by going from a 30 year to a 15 year loan.

Take your money and pre-pay the principal yourself. The $3,500 would be a nice chunk toward the principal, and a $100 additional toward the principal will get you there just the same. Don't pay some stranger, when you can pay yourself first.