I used it for a good few years when it first was a thing. It’s pretty decent when you are close to the server and have stable enough connection. I played quite a through few steam games this way through geforce now. Even cyberpunk 2077 was a great experience on it.
It’s a great stepping stone between getting new hardware but once I finally got my PC I just stopped using it.
Now gfn was the only good implementation cause it used your existing steam (and I hear now Xbox) library, instead of being locked to the app itself, so you could even see it as a extension to your setup