I tried geforce now, it's amazing, lag is almost imperceptible with the 8ms ping I had.
Even for casual gaming it was horrible. Can't imagine something multi player.
It works just fine(tm) on the two fiber connections i've tried, one 500 mbps only, not 1 gbps. It only uses like 10 mbps for 1080.
It's the latency and packet loss that kills you, it's unusable on wifi going though the same fiber for example.
The lack of noise actually made me prefer it over my gaming box. It’s a real home run for people fortunate enough to have excellent network connections to nvidia’s data centres.