I've only had 10 minutes. Works without any additional settings on configuration. The games on the main rig simply appear in the games tab and launch as if they were installed locally. Note the game will also launch and screen on the origin machine.
It works very well on my wired connection. Tested :
Nidhogg - gotta start easy. Seeing the the host screen in the background i did not notice any lag.
Amnesia - no prob.
Civilization V - opened a late game, frame rate was not top notch, but definitely playable.
Kentucky Route Zero - no prob
Borderlands 2 - got an error message along the lines of "error streaming"
Alice: Madness Returns - had to log into the EA DRM again, but no prob after. Worked very well with the 360 controller. Such a great game.
Gothic II - "Game does not support streaming". I wasn't expecting that to work anyway...
The host runs at 1200p, the client at 1080p. There is a thick black border and the graphics seem a little smudged. Def some interpolation going on there. I'll have a closer look at that the next days.
So far I am very impressed. Finally I'll be able to finish gamer such as Alan Wake, LA Noire, GTA IV, etc which just play better with a controller and on a couch. Very exciting!