I've had Geforce Now for over a year now and have completed The Witcher 3, Assassin's Creed Odyssey, and Death Stranding on it. I use an Nvidia Shield to play it on my TV. I've never had any problems with the streaming quality or latency. I could see that depending on location though, I'm playing in West Coast Canada. Some of the games I've been disappointed with the performance, Assassin's Creed Odyssey for instance couldn't hit 60 fps even after lowering the graphic settings. Cyberpunk 2077 has been amazing though, high fps and maxed settings, including ray tracing.

A few other things of note. 1080p is the max resolution. Unlimited Internet is probably a requirement as its about 10gb per hour. After 6 hours the session ends and you need to save and relaunch the game. Your entire Steam library is not available, its up to publishers to allow their games on it.