Update (September 7th @ 9:34pm): It's been pointed out in our comments that the new GeForce Experience cannot be used without logging in. It supports NVIDIA, Google, and Facebook accounts.
It's been in Beta for a while, but NVIDIA has just officially launched their new GeForce Experience application. The release version is 184.108.40.206, so be sure to check for updates if you were in the beta and your settings panel shows an earlier version. Also, there's an “allow experimental features” checkbox right under the version number, too, also in the settings panel. It defaults to on for me, so you might want to take a look if you use GeForce Experience for anything professional (ex: Twitch streaming).
Anywho, the new version runs a lot better for me than the previous one. I used to have quite long load times, often literally in the minutes, with version 2. With version 3, it often pops up in less than a second, or maybe a couple of seconds at the worst.
Obviously, if you don't use GeForce Experience, then you don't really need to update. WHQL drivers can still be downloaded from their website (although installing drivers through GeForce Experience 3.0 has been fairly bug-free for me) and most of its other features can be obtained with other applications, like OBS Studio. That said, it's free and pretty good, so it's worth giving it a try.