Only had a short time with it so far but:
- Feels nice in the hands than the old one
- Screen is amazing, and a very nice size
- Batocera doesn't work yet
- Did manage to get Chaiki to work (kind of pain, but should be ok now that it's set up), works very, very well with the oled steam deck. Its not quite as "clear" due the lower resution vs the portal, but it's completely ruined me on the portal so far. When I switch back the the portal, which I love the controls, the size and sharpness, but when I move (say, look left or right) there is so much more smearing going on. I had to go back and forth a couple of times just to see if it was just me exaggerating and so far it doesn't seem to be the case. It was the one thing I was most complaining about on the portal (corrrcted, said steam deck by accident), so it's not a complete shock but when you switch directly between the two it's more obvious.
Also of course the black levels and contrast are also better on the steam deck, even though the portal screen is actuall quite good in terms of contrast and color.
Going to try and get some xbox local direct streaming going, had it working breifly and it seemed fast/responsive but the keys are mapped yet so I have some work to do.