Interesting review IMO, with colour accuracy comparison and benchmarks of DeckHD vs. original screen (and other “known good” screens).
I would be more tempted by an OLED screen upgrade, but colour accuracy looks pretty good tbh. Pricing is in line with an official (matte) screen replacement from ifixit - $99 USD.
And without doing a better GPU what’s really the point? Slower frame rate and a bit more resolution? Not what’s important in a portable console for me.
If you stream a game from a PC with a stronger GPU, a better screen makes a difference, and you can still run lower resolution when away from home.