Rather than muddy up the other thread...
Do you like sliced bread? If so, you'll love the Steam Deck. Best thing since...
Basically it's a PC handheld centered on gaming. There are several other vendors making PC gaming handhelds currently, but nothing has come close to the value of the Steam Deck. Some features of this great device
- 7 inch display (unfortunately not OLED) - 1280x800
- dual analog stick, dual haptic thumb trackpads, 4-way pad, analog triggers - you can remap the controls for any game to your liking (e.g., I have some Dreamcast emulated games that out of the box only use the 4-way pad, and I can remap to the analog stick)
- Bluetooth support - can connect any bluetooth controller (PS5, Xbox, Switch, ...)
- Comes in 3 models based on internal storage - 64, 256, or 512gb, and you can add more storage via microSD cards
- With a docking station (official Steam or 3rd party) you can hook via HDMI or DP to any monitor for greater resolution. You can also attach mice, keyboards, steering wheels, etc with a docking station
- Linux based, but if you want you could wipe and load Windows
- Battery life does suck - depending on the game you can get anywhere from a couple of hours to 8 or so
The library really expanded when the user base developed tools to allow other gaming services' libraries to be accessed. While you can get to your libraries of GOG, EA Origin, and Epic, I personally only have Epic as an additional load on my Deck (Epic has a free game or two each week, and during the holidays they give out a game a day (I've gotten games like Metro 2033, Saints Row, Shenmue 3, Shadow of the Tomb Raider, Star Wars Squadrons, and Watchdogs 2 for free).
Another tremendous feature is emulation of old systems. Emudeck is a packaged emulation treasure. It's easier to just point you to the systems it supports - https://github.com/dragoonDorise/EmuDeck but it runs all the old systems as well as up to PS3, Xbox, and Wii U. I personally only have Dreamcast and Saturn games on mine currently, and it has been awesome having them on a system I can travel with or while laying on the sofa or in bed. Game compatibility is down to the quality/development of the emulator, but Emudeck allows you to update emulators as they get development releases.
I personally bought the 512gb version for $649. It was a long haul - waited nearly a year to get it, but now Steam has caught up with all preorders so there should be no wait. I've got 60+ Steam and Epic games on there and about 2 dozen Dreamcast and Saturn games.
The only downside I've had with it so far is that in my opinion racing games suck on it. Using a wheel and VR the last 5 or so years means playing with thumbsticks and 2D screens is a no go. Other than that I have really enjoyed the thing. Took it with me to the Netherlands on a work trip to pass time in the airport, plane, and hotel. I bought a Switch OLED last year, but the Deck gets most of my time due to the software library I've built up and the fact that software for PC generally runs cheaper than consoles, be it in comparison to physical media or downloaded games. The Switch is relegated to first party Nintendo titles only.
FYI - https://www.steamdeck.com/en/verified shows some of the highlights of recent games verified for the Deck and https://store.steampowered.com/greatondeck has a more exhaustive list. Note that even games that Steam says aren't verified have been demonstrated to work fine. Steam is in the midst of their winter sale, so great deals can be had on thousands of titles.