I captured some footage in case anyone's interested in seeing this running without downloading the client and setting it up.
I was honestly quite impressed: https://www.youtube.com/watch?v=GiNNx5mnKIc
So I've played a whole bunch on Windows 10 and this really works well. Even played some multiplayer Street Fighter and won matches no problem.
So I just started a 7 day trial on the ps4 and WOW, this service is great!
Played some Katamari, Mercury, Asura's Wrath, Adventure Time and I just beat Journey for the first time. I need me some Demons Souls!
This is what a lot of us have been trying to say. The service works if you have a solid connection and/or near a data center. Some people will try to convince you that there are 200 frames if input lag in every game.