Being an avid "shower shaver" I've tried quite a few fogless mirrors over the years, only to learn to live with the reality that I would have only a handful of shaves in the shower before the mirror (any) started fogging up, signaling that it was the end of enjoyable shaving experiences, until the next mirror!
But when I started to really search, and read reviews, I had to try this one.
The result: Best shower mirror I ever had! Works exactly as adverised, and I am so done with mirrors that fog up after a month of use. Living in CA, we have very hard water, so as long as the mirror is kept dry after the shower using the supplied squeegee, all is perfect again!