Hi, I purchased the cosmos and ended up taking it back had it for 3-4 months was a lot of up and down with the tracking sometimes it was ok others unusable. Ended up getting a vive pro was a little worried I would notice a lower image quality form the cosmos but that wasn't the case the oled's improved the colour a lot like going form norm screen to hdr and didn't notice any lower resolution, sweet spot is also an improvement for me over cosmos.
Tracking with the vive pro (steam vr 2.0) is amazing even when I thought the cosmos was working fine it wasn't compared to base station tracking almost like a lag or delay on the cosmos.