Is Micromax2 that bad? - Tile Advice

[redchair]

Hi,

Bought Micromax2 Gunmetal on the advice of the bloke at the tile shop. Tiling metros in shower enclosure. I've been browsing the threads on here and people seem to think its not too clever, rapid setting and can scratch tiles? Also, on the tech sheet its not waterproof.
Its took me (a COMPLETE NOVICE) a lot of effort to build this shower enclosure so really would like to not screw up with the grout. Any opinions welcome, I'm more than happy to change the grout if its advised.

As always, thanks for your responses.

 

[redchair]

Done some more research. Seems the Kerakoll Fugabella Colour has good water resistance, is flexible and can use shower after a few days.