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via Customer review from APC
Until you witness this device clamping down during a lightning storm which I have done, you can't appreciate the protection it offers. Just reset and you are back in business with no damage to the connected equipment. I have seen the competition fail both when protection should have kicked in and just like that, one day the competition decided to blow a component on the circuit board and an acrid smell eminated from it. Needless to say I replaced it with this APC unit.