AT&T U-verse gateway boxes are notoriously susceptible to nearby lightning strikes. Every time a thunderstorm comes through our area, the AT&T truck spends the next day replacing burnt out equipment. We lost numerous gateway boxes over a three year period. After installing this in several locations, not one gateway box has gone out in over a year and a half. Great product, very easy to install, just make sure it is connected to a very good ground. It uses gas-discharge tubes (just like AT&T used to install on land-lines) rather than diodes so it should last indefinitely. AT&T should be installing these and save themselves a lot of money replacing gateways and aggravated customers.