Hello gang - many thanks again for the help on this blog.
Basement remodel almost done - nearing drywall. I'm planning on using a Kerdi drain, floor, curb and membrane for the walk-in shower stall, with tile over. Now their literature says to use regular drywall, but all of the installers (2 so far) I've had look at the job think it's nuts and propose some other, I think fiberglass stuff, with ceramic screws.

I guess I'm looking for some experience-based opinions that the Kerdi membrane and system are reliable, and that going with their (Schleurter's) specs - despite the drywallers' reticence - is OK.