The big question mark for me is controller support, particularly for wireless controllers. With the app still in beta, I imagine it's only going to get better. Other Samsung models may also have more issues the app works on all of its 2016/2017 4K models. I'm guessing some were using Wi-Fi, and the KS8000's Wi-Fi antenna isn't exactly stellar.

Other users seem to have mixed results-judging by the comments on the Steam forums, some have trouble getting the TV to recognize their PC or have issues with lag. I was able to play at 1080p, 60fps, and the visual artifacting I experienced during Hollow Knight was, I'm guessing, a result of Steam's stream encoding and not the fault of the TV hardware. I was worried my TV wouldn't have the processing power to decode the gameplay video coming from my PC, but nothing I played seemed to indicate that was the case. I also dabbled in the hilarious Jazzpunk and played through a run of Enter the Gungeon before feeling satisfied that streaming works through the TV as it should. I have no idea why I own that game, but it works well with Steam in-home streaming. For kicks I installed Castle of Illusion, the remake of the Sega Genesis Mickey Mouse platformer, and it played just fine. Dark Souls 3 ran flawlessly, and I played about an hour of the original Dishonored with no issues and settings maxed out. Thankfully, everything else I tried after that fared better. Weird, but I decided not to question it and get into some gaming. Out of frustration, I tried a wired Xbox 360 controller instead. The Steam controller, at least for me, was unusable. Fresh batteries and a controller update via my PC didn't seem to make a difference. I plugged the Steam controller's wireless dongle into the Samsung Smart Hub's USB port, and it did recognize it, but it only accepted one out of every 10 inputs or so. The introductory post on the Steam forums said that the beta version of the app currently only supports the Steam controller. Now here's where I ran into a bit of trouble.

I have both wired with Ethernet, which is ideal (and probably mandatory, at least for the PC end) for good quality streaming. Launching the app brought up a familiar Steam in-home streaming interface, and the TV saw my PC on the network right away. Getting up and running was as simple as searching for Steam Link on the TV's app store, downloading it, and making sure my PC was online.

Steam link 4k samsung