Image - Video from Reddit.

It only affects handheld mode, but there is shimmering and upscaling artifacts. In docked mode it’s fine.

It’s not really worth AUD$8/US$5 though, it’s only a resolution and framerate upgrade (60fps mode already existed but was masked out, it’s been available on emulators using the official code since last year) and it’s still only SDR. Mario Odyssey had a free upgrade which added 4k/60 AND HDR.