We had GF at our show and Tom demoed to 1,000's of folks and it was one of our best sellers at the show - especially with the hardener. It is a very popular item these days.
I've used it and I've been happy with it. I finished my work desktop with it and the daughter's desktop with Rubio and frankly I don't see much difference in quality. I think if I was going to go further and apply a nano ceramic coating I'd likely go with the Rubio simply because it appears those two products are made more for each other.