I like the Marmox, though I have usually fitted Impey. Marmox are cheaper and a hell of a lot lighter. Had problems with people walking on Wedi and leaving indentations, not keen on them anyway. I have a disabled access wetroom to do next week and have been told that the marmox or indeed any of the foam based formers may not be up to the pressure loading of wheels or shower chairs when tiled with mosaic. Anyone got any experience to confirm this? Not taking any risks as its a re-do after a builder tiled a flat concrete floor with flat tiles so using an 1850x900 Impey.