Amazing. One of the best purchases I've ever made.
It's rare for me to see games in my library that are not supported, although there are a few. But there is a difference between running and running well. Demanding games will get maybe an hour of battery life and the fans will be pretty loud the whole time. Some games (especially strategy games) really work better with a full keyboard and a higher resolution screen. Some games I just would not want to play on a handheld. But most of the time the games that I want to play work well.
One trick I use to get better battery life and performance is streaming. I use Chiaki to stream from my PS4, and Steam Link (as a non-steam app lol) to stream from my desktop. It's often worth it for the fan noise reduction alone.
It's even better at emulation. It's a great machine for PS2 and GameCube games- I have the back buttons and track pads mapped to speed up, pause, slow, and rewind gameplay and to control save states. I have not dialed it in yet, but I think with some tweaking you could probably use the gyro and/or track pads to do some good Wii emulation. 3DS and DS are great too, mostly because of the track pads. Anything older emulates fine, but isn't as impressive.
I have gotten PS3 and Switch emulation to work, but the fans go on and the battery life goes down, so I don't really use it for that. Plus storage is a bit tight and PS3 games are huge.
It does feel like Valve was just a little too early. I wish the screen was 1080p.
The 2230 SSD's that it uses were kind of uncommon when it released. The weird size made them more expensive and they had lower capacities. I managed to get a 512GB one, but I wish I could have gotten like 2TB. It seems like that's changing now though. Similarly, I wish microSD cards came in larger capacities. Storage just seems to get used up so fast these days.
I see two unrelated articles that it hink address similar problems.
For handhelds, Sony is good at making hardware, but has generally failed to develop a good library of 1st party games. In order to be successful, a platform needs enough hardware sales to be an enticing platform for 3rd party developers, but you need a game library to drive hardware sales. That's where 1st party support comes in, and where Nintendo has generally been great with their handhelds. Sony tried to have a more even split, but ended up focusing on their home consoles when they were pushed.
The second is emulation. Sony has a significant library of old games, and even more if you count 3rd party titles for Sony's old consoles. Really popular games often merit full re-makes. Slightly less popular games get re-released or remastered, sometimes in collections. A lot of games aren't popular enough for that, but if you could find a way to charge people anywhere from $1-$10 to play through the original version it would probably sell (and having a platform the 3rd party publishers to also sell their old PlayStation Roms would probably let Sony take a % for almost no additional work). The problem is... The Shadow of the Colossus remake released for $40 initially and is still $20 initially today. If we were able to pay $5 or $10 for the PS2 version back in 2018, would the remake have even been possible?
Beyond that, does would a greater emphasis on releasing older games on emulators possibly cannibalize new game sales? Are there going to be people who, when GTA 6 releases for $70+micro transactions, would eye up Vice City or San Andreas for $5 or $10 and no micro transactions instead?
I think they could address both issues with a retro handheld. Cheap Chinese retro handhelds have been really popular the past few years- imagine one with the build quality, controls, support, legitimacy, and increased price tag of being from Sony? If it could play PS1, PS2, And PSP games that a gigantic library available that's mostly sitting idle right now. You could probably get by with a 480p screen too, although if Sony wanted a more premium feel 720p would still be fine. I'm also not sure if they would go 4:3, or expand to 16:9 to allow for the games that did support widescreen to use it, and for the PSP. Vita and PS3 would be cool, but I'll assume they aren't realistic for now.
From my experience with the Steam Deck- having dedicated extra buttons for save states and fast forward/slow down/pause/rewind breathes tons of new life into old games. Not enough check points? Really long unskippabke cutscenes or load times? The classic "unskippabke cutscenes before a long and challenging boss fight that makes you rewatch the cutscene every time you die"? All solved with save states and fast forwarding. It also helps with these games being designed for longer play sessions than would be typical for a handheld.
What I'm not certain of is- would this be differentiated enough to not cannibalize any new game sales? I suspect confining it to a separate, handheld platform would help to make it make sense. Maybe the dark horse candidate is Sony releasing a PC app on Steam as well, but I think cannibalization would be a different concern there.