Huge difference in price

[DavidJ]

I found some good words on this forum about UltraTile ProFlex currently going for 13.14 / 20kg inc. vat online here:
Ultra Tile ProFlex SP+ES Standard Set Wall & Floor Adhesive S1 - Grey - https://www.pureadhesion.co.uk/ultra-tile-proflex-spes-standard-set-wall-and-floor-adhesive-s1-grey.html

Yet the local Tile Giant wants nearly 3 times the price for Mapei P9:
Adesilex P9 Grey 20kg Wall/Floor Tile Adhesive - http://www.tilegiant.co.uk/adesilex-p9-grey-20kg-wall-floor-tile-adhesive.html

Is it worth 3 times the price?

 

[One Day]

no

 

[Dumbo]

Personally I don' like the ultra but still no