ING continuously pitched me to refinance my loan because interest rates were at historical lows. I did so, and didn't see buried in the fine print a clause called the 'Interest Rate Differential'. While most loans charge you a 3 month interest penalty if you sell your house and pay off your loan, ING charges you a penalty if the interest rate changes. In my case, the interest rate dropped by one half of one percent and it cost me $10,000. The savings I got on my monthly payments was negligible compared with the penalty I got. They also tried to claim that the 'present value' of the interest on the loan was all the interest payments I would have made added up. They refused to bring the interest stream to present value so my penalty ended up being almost twice the present value of the interest I would have paid them.