Absolutely loving it so far. I am not a huge gamer nor do I have the time to play as often as I'd like but its great to pick up and play for an hour here and there. Been playing GTA IV (which, IMO, was a better game than GTA V) Sega Bass Fishing (loved it on Dreamcast) and Powerwash Simulator sounds shite but honestly its a good game for chilling out and it plays great on the deck.
I find myself playing it far more than I ever did with my Series S, or my old gaming PC.
I've installed emudeck but not got round to getting any roms or bios on yet. I'll mainly be going for PS2, Dreamcast and N64 emulation but I want to have a go with Yuzu and try some switch games.