never have liked mapei grouts, have used kellakoll grouts recently. The fugalite eco -liquid ceramic is a bit like epoxy but easier to use, takes a bit of getting used to.
The fugabella porcellana eco 0-5, comes in 32 colours ( avoid the coffee its twice the price of all the others) its so easy to use and a whole 50 metre floor can be done and have time for a tea break before washing off.is also good foe the metal mosaic no scratching.