Rental property Using ARMs?

[P M]

Does anybody here use ARMs for buy and hold rentals (not flips) that they expect to hold for more than 3-4 years as income properties?

Is this too much tempting fate on the 50% rule?

If you are using ARMs, are you pre-paying your mortgage with some of your cash flow to reduce risk on the ARM reset date?

I'd love to hear any ARM strategies that people believe have neen successful, and how much risk they brought to the table for your deals.