Even if it's total crap in 5 years, it's still 5 years where it's NOT blue/green aquamarine. :-)
But according to this individual's references which I checked, he's been doing their rental unit tubs/tiles for over 8 years and they haven't had any problems.
Durability is the concern, of course, but on the bang/buck scale, it's very hard to argue against the aesthetic bang you get out of this process, even if it only lasts 5 years.
Best Regards,
-- Todd H.