I've used it before. It's pretty labour intensive actually - sugar soaping down all the tiles, rinsing, allow to dry. Then two coats of tile paint, plus two more coats of ordinary gloss.
It's okay, but tbh nothing more than a stopgap solution - in areas of high usage/moisture, e.g. around the sink, it's starting to peel a bit, after just over a year.
Also, while it looks 'grand' it does look like what it is - a cheap, temporary solution to disgusting tiles!
Having said that, I could not have lived with my bathroom for the last year if I had left the tiles the way they were, so it's done the job for me.