I picked up a 128GB Quest a couple of weeks ago (you'd think my PSVR and Rift S would be enough). Setup was a breeze, the tracking and graphical fidelity are quite nice and of course the untethered nature of the headset feels great. I've played a few games - Vader Immortal and Drop Dead Dual Strike Edition - and am impressed and how well they hold up visually compared to their PC counterparts but the wireless design is so freeing, especially with the lightsaber dojo in Vader Immortal.
The streaming capabilities are really impressive. The Amazon VR app lets you watch your Prime content in a virtual theater; Youtube VR works quite well and Bigscreen shows a lot of potential (the 3D previews channel looked quite good with nice depth and pop).
Right now a big issue for me is a lack of exclusive content. Way too many games are titles I've played and long since finished on my PSVR and while I'd be curious to try some of them out again on the Quest I really can't justify buying them again at full price. Hopefully we'll get a few sales eventually.
The other minor negative is headset comfort. Between my PSVR and Rift S I'm used to the halo design where the visor hangs in front of your face and having the Quest strapped to my face just never feels as good. The unit is definitely front heavy and the facial interface starts to dig into my cheeks after a while. The VRCover replacements might help but they're backordered and won't ship until mid-September.
Overall though it's a fun device with a lot of promise.