Controversial opinion, but if cost isn't an issue then a steam deck isn't a great buy. It fills a niche for sure but honestly a gaming laptop with a gamepad is 100% more useful IMHO.

I struggled to find it anymore portable than a laptop is and worse performance/screen/utility in almost every measurable way.

It comes with a free Portal-universe game that teaches you how all the controls work. It's fun. Play it immediately. It will teach you that the thumbsticks are capacitive. Turns out that's a useless feature, so just get some nice thumbstick caps that make them larger, more rubbery, and more comfortable.

I highly recommend a 180° USB-C adapter to use the power cord while playing. It makes the cord angle down instead of up, which feels more natural. Plus, I feel like it would be gentler on the cord and USB-C port if the cord got tugged hard when plugged into an adapter instead of directly into the Steam Deck.

Plus, with a 180° adapter, you can keep the Deck in it's case while charging. Normally you can't do this because the top of the Steam Deck faces the hinge of the case. But the adapter fits in the case OK and reroutes the wire downward. It definitely raises the deck up slightly, but you can still zip the case halfway closed. I do this because I live in a very small apartment with a high chance of knocking or spilling something onto the Steam Deck if I were just to leave it laying around.

Fun fact: the touch pads don't actually click when you press them like a button, but you will swear they do! The haptic feedback mechanism is incredibly good.

Major Overheating Issue

I don't know how this is not a more widely complained-about problem.

I paired a Nintendo Switch Pro Controller to my deck, played a game, then put the deck in its case while asleep. (You tap the power button and the deck goes to sleep.) Well, apparently, "Wake on Bluetooth" is enabled by default and you can't turn it off! So, I threw my Nintendo Switch controller in a drawer, and of course a button got hit. It woke up my Steam Deck in it's case. I had a game running, so the Steam Deck starts rendering the game and creating a lot of heat that is just being circulated within the case by the fan. The Deck got insanely hot!

I noticed it sometime later only because I heard it make a sound. When I took it out, I used my infrared thermometer to measure the back of the deck, and it was over 140° F. Uncomfortable to touch! It would have sat there for hours like that if I hadn't noticed.

Solution: I had to install the Decky Loader plugin system in order to install a plugin that disables Wake on Bluetooth. I still don't see any way to disable it without using Decky. Decky is pretty great though, and it has tons of cool plugins. Of course, you could also just turn off Bluetooth before putting this Steam Deck in its case, but if you forget, it'll be a problem.

Don’t buy it for AAA games. It thrives on AA and indie games, but AAA games will suck the battery like crazy (on the original model, at least) and you’ll be lucky to get 60 frames on any AAA games from the last few years.

If you're into cosmetics the only way (that I'm aware of) to get the fancy Steam profile stuff and special keyboards is to buy the 1TB version. If you're interested in customising your Deck with themes, intro videos and the like the 1TB version is the way forward as space gets eaten up quickly.

It's worth buying a screen protector and a small, fine paintbrush to dust out the grooves and vents.

Enjoy your Deck!

You may become spoiled by the Steam Deck's excellent controls, such that no gamepad currently for sale will ever come close.

For me and Rimworld, I became dependent on the four back buttons, and now I can't stand playing it on desktop with a controller because no controller on the market offers four additional buttons that work like that (as far as I know)

Sleep takes battery even if nothing is running. It's big so if you will play only steam deck for a while after that every controller would feel small and nintendo switch would feel like baby toy.

Get the 1TB with the etched screen if you’re considering it. It looks fantastic, and works great when not indoors. Like, in a car or airplane for example. I was debating between it and the 512GB because I often prefer a glossy screen, but the effect is small yet mighty.

Also, get Moonlight on your Steam Deck and Apollo on your PC. You can stream games from your PC with Apollo to Moonlight at much higher quality than Steam’s own streaming system. I send 1440p to my deck so after chroma subsampling I get fully defined 1280x720 pixels. It looks significantly better than just sending 1280x720 or 1280x800 to the Deck.

And finally, pick up Geometry Wars 3. It’s like the perfect pick-up-and-put-down game for the Deck.

Simple stuff to prevent you from panicking early on:

• Say you're playing docked with an external controller and you put your steam deck to sleep while playing a a game. After it wakes up the next time you use it, 99% of the time, the game won't respond to the controller input anymore. You need to reorder the controllers in the menu and it'll come good again. Only in extremely rare cases have I had to restart the game.
• Less so now, but early on there were definitely cases where I had to power cycle the steam deck because something went wrong. Even if the screen is black for a bit, just give it some time.
• There's years of tips/tricks or software mods that people have collected that may/may not be relevant anymore. Just play it for a week or two before tweaking things. For instance, I love Decky loader for adding things like protondb support and how long to beat times to the library... but you definitely don't need it.

If you do decide to play docked, Sony Dualshock 4 or Dualsense 5 controllers are great because they have touchpads. This makes them super useful in games with half implemented controller support (i.e. the games work fine but the menu controls still use a mouse) or using desktop mode from the couch. They also have gyro support too.

I haven't had many issues with PC usb-c hubs... but all hubs are created differently. If you care about 4K output, VRR, HDR or anything above basic usage, I found a dedicated jsaux docking station works pretty well (note: I never considered the official dock as it was only officially available in my country well after I already had a steam deck).

You might want to upgrade your couch & TV. If you’re used to playing at a desktop, it doesn’t feel right to play a handheld in your gaming chair. You can plop down in a big comfortable couch, put on a TV show or movie in the background, and grind through whatever game you like that runs decent.

It’s good for when someone else wants to watch a tv show you don’t care about, so you pop out your deck and spend time together doing separate things that interest you.

Remember your admin password if you mess around on the Linux side.

The OLED has a bunch of upgrades over the base model that aren't obvious. It's really worth the splurge.

Other than that, don't get too caught up in the hyperbole and expect to play things mostly up to the PS3/360 generation AAA and indies. Newer games will run sometimes but it's often not worth the hassle. There are exceptions, particularly in games that have specific issues in other platforms, but... you know, it's a 3 year old handheld, keep your expectations in check.

As others have said, spring for the OLED at the lowest storage tier, refurbished if you want to save a few extra dollars and have patience.

The ssd upgrade is easy to do and on the wallet. Another minor upgrade I'd suggest are PlayVital back button covers...makes those a lot easier to use.

Depending on our use case, one of the newer 3rd party SteamOS handhelds may be a better option. Steam Deck does not ramp up performance when connected to a power source, for example. OTOH, if your use case is mainly portable with long battery life (so not ramping up performance by spending more energy), the performance difference to the newer devices is non existent any more, even skewed slightly towards the Deck.

Do yourself a favor and get the OLED model. The OG Deck's LCD screen is really bad by today's standards. The OLED screen and the dual touchpads are the two features that still stand out compared to the more recent competition. I don't use the touchpads that often, though. For me personally, there are no must haves.

Look at the games you want on Steam and verify they'll work to your satisfaction.

Finding a good USB-C Hub for your needs is a good thing to know before purchasing if you want it docked at all. Whether the official steam deck dock suits your needs, or a third-party hub on any tech website you can find.