I do own Euro Truck Sim 2, that game not only for steam link, but whenever I get a job that pays me more than poverty to afford a VR headset, that game is what that shit is made for. VR HEADSET AND RACING WHEEL!
Tried street fighter 4, and maybe its my laggy tv, but the input delay is too much for me to deem playable. Maybe to casuals who can't tell the difference, but my over 800 hours of experience with that game, I damn well know the timing is off on steam link. I can do viper tk feint combos with it, but it's less consistent than just being on pc or 360.
I did manage to wirelessly sync my ps4 controller to the thing and booted up south park stick of truth (which i immediately stopped playing due to an unable to save bug), and at least in the hour or so I've played, it works great. No access to a keyboard so my name ended up blank (not sure if its just the game though, cartman calls you douschebag regardless), and I had to move my pc mouse off screen so it wouldn't be in the way, but besides that, plays like a console game with faster load times.
Not a bad little toy for the $15.90 I payed for it.