Grimly Curmudgeon wrote:

Plastic trays are rubbish altogether - I haven't seen one yet that's
lasted anything like a cast one and even if they don't get cracked or
holed they just never feel solid enough.

We had to have a plastic tray, Showerlux, for the bathrom because of
problems with the age of the floor, clearance for drainage and the weird
slope due to the age of the building. I was reall unsure about using it,
because all previous trays have been good quality ceramic, but we didn't
have much choice.

I've actually been pleased with it. It is as solid as a cast tray, it
was a doddle to install and level. It doesn't move or creak, it feels
absolutely solid.