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I don't check mine to often. Had to replace the one in the bathroom last year when a thunder storm knocked it out. The same storm knocked out my neighbors tv and stereo.
I've tested those more often than I've meant to... It's just so easy to accidentally hit that test button and then think your hair dryer or curling iron is broken when it won't turn on... Other than that I've never actually thought of checking them. I didn't know it was important to do so.
Our house was built in 1959...most of our plugs aren't even the three prong grounded outlets. I've been shocked by higher than household voltage at work before. No biggie. Just stings for a few.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.