Adjustable-Rate Mortgages benefit the borrower when the interest rate is higher than in previous years and deemed likely to drop to a more affordable level in the future.
Adjustable-rate mortgages usually start at a lower percentage rate than fixed-rate mortgages. If you plan to pay off your mortgage fast, the adjustable-rate might not have time to change.
If your job needs you to move frequently or if you plan to sell your house within a few years of purchase, rather than keeping it forever, then an Adjustable-Rate Mortgage is the perfect choice for you.
You will have the benefit of lowering rates without refinancing. You will not have to pay a new set of closing costs and fees.