I got mine last Thursday, and had a bit of trouble setting it up (it wasn't connecting to the network over the Ethernet over powerline adapter even enough to update itself--only connecting it to wifi fixed that, after which it did connect to my PC running Steam over the wired connection). Played some Borderlands 2 on it this weekend, great at 1080p with a 30 fps cap, an unplayable slideshow trying to do 60 fps. FYI, the computer is an i5 2500k paired with a GTX 970.
Now I'm wondering whether to go for the Steam Controller (for now I'm using a wired 360 controller) or stick with the 360 controller and just have a Bluetooth keyboard with trackpad like the Logitech K400 (mostly for getting past keyboard/mouse-only launchers). Anyone got impressions of the Controller or the use of such a Bluetooth keyboard?