I haven't tried Stadia. I tried PS Now on a wired connection, using a 1Gbps fiber connection.

It's not ready. I played Infamous 1 and 2 and it would get choppy during complex events and the latency was noticeable. Sometimes my character would just keep moving until it registered on their server that I let go of the joystick.

If I had a bad experience what chance does everyone else have on slower connections?