Is "Grout Boost" any good????

Hello All,

As the thread says, is Grout Boost any good or worth using? Please respond with personal and definitive opinions/experience.

1) Even if it only partially helps to block stains it would seem worth it for an exterior tiled patio (as I'm in the process of finishing). Are there other qualities to it that should also be considered?

2) Does it make the grout install more difficult and what about cleanup?

3) Does it slow the curing process of the grout?

Thanks,
Ralph