[stomachmonkey]

Your info is limited but my gut tells me you are not really saving much.

Assume $500,000 float for 30 years. Let's pick a ridiculaous rate of 10%. Costs you $4387 per month.

Move the rate to 9.8% and your payment goes down to $4314.

Basically $70 a month. Or $840 per year. $25200 over the life of the loan.

If you threw an extra payment at it each year you'd reduce the payback by a few years and save $100,000 on the total cost.