Any thoughts on EverSeal for flat residential roofs?

[James Mc Ree]

I saw an ad for EverSeal offering a 50-year warranty for their flat roof system. It is presented as a liquid that is spread over an existing roof after some preparation. The product appears to be more than just a coating as it goes on in some depth, then hardens into a seamless layer. It appears to be marketed as a product that not only is a full roof solution like I would think of as a new rubber roof, but would address leaks and flaws in the existing roof such that the existing roof need not be torn off and replaced. I am sure there is some limit to that, such as the roof needs to be structurally sound.

Can anyone share experiences with this product and its installation? The ad and some reading of their site piqued my interest for my residential property roofs. My residential properties are mostly rubber roofs that need coating every 3 years and replacement around 15 years +/-.