Question about Xiaomi Mi Laser Projector 150"

@simbuggel --> Hello, do you have shadows on the screen?

So how much would the quality suffer is the question...? Are there any experience reports?

I also had a roll-up canvas at first (https://www.digitec.ch/de/s1/product/elite-screens-m100hsr-pro-handbetrieben-rollo-100-169-leinwand-2480196), but will now return it after a few days. The unevenness was too visible (waves, shadows), which made the picture really unsatisfactory.
With a built-in canvas (stretched with a fixed frame) (https://www.digitec.ch/de/s1/product/elite-screens-sable-frame-er92wh1-fixer-rahmen-einbau-leinwand-92-169-leinwand-8271878) the picture is perfect - so I would recommend such a canvas.

I simply operate the projector on a white-painted wallpaper wall that has a slight grain in it. At a distance of three/four metres you don't notice it, or it doesn't bother (me) any more.