In their original plan, NVIDIA intended to make GeForce Experience the one true portal to driver releases, making registeration a de facto requirements to get NVIDIA's frequent driver releases. Instead, NVIDIA has still opted to require a sign on for GeForce Experience, but has backed off on the driver portal aspect. Instead they continue to issue new driver releases through their web page, even though, according to NVIDIA, that the majority of their driver updates are already served through GeForce Experience.
NVIDIA states that GeForce Experience 3.0 runs three times faster and uses half the memory. When putting this to the test on my machine my measurements were more like two times as fast and a third the ram. Granted, this was just a quick and informal test on my personal system and results likely will very, nevertheless it is indeed faster and in my case the new version uses a miniscule amount of ram. In fact while 3.0.5 started up with 88MB of ram is shortly settled in with only 54 MB of ram used.