And once Oculus Link is released, the Rift catalogue will be available for the Quest, and I'm considering upgrading from a Rift now that it seems like a real upgrade. I'd say a product which convinces current adopters to upgrade so soon is a success.
I bought mine in May and have been using it around 6-8 hours a week for working out (Box VR, Beat Saber). It is really a nice device for that, I’m not sure about gaming however.
The kicker of course: it's an untethered system (which is great but sacrifices some visual quality). But even if that's an issue to you, shortly Oculus Connect will be available and you can use it as a viewer connected to your gaming PC.
Quest is the first VR product that actually has the potential for mainstream success. Phone VR is tedious to use and PC VR provides a good experience but is expensive and only a small percentage of adults want a gaming tower PC in their homes in 2019.