Hello, I purchased Vive Cosmos about a week ago. All of my previous HMDs were Oculus, so I had some initial minor setbacks with steam vr, attempitng to use revive, etc. My main issue with the headset now though is the tracking. I get regular warnings, "Your environment is dark" and "learn how to improve your tracking" etc, and my main issues with the tracking are: 1. My hands seem to jigger, shake and change position constantly. Especially visible in Blade and Sorcery, I put the controller at arms length in front of me, and the hands and arms change position slightly every second or so. In some games its almost unplayable due to that jitter, for example Star Shelter on Viveport 2. In Blade and Sorcery, if i just stand straight with my arms relaxed next to my hips, in the mirror my charachter's arms tremble and shake and also sometimes become really long almost touching the floor. 3. Very difficult to pick up objects from the floor, tracking just goes haywire, evident in the game like Abode 2. I spoke to the support, and overall they were quite good and helpful, however none of their solution worked to improve the tracking. I also tried beta versions of vive software and steam vr. In my room I have four warm white LED celing lights, I tried adjusting the brightness but whatever I do, I still get the "dark environment" warning and tracking issues. Normally, I would probably just send the HMD back for a refund or try to sell it on eBay, however I really like the Cosmos otherwise - the visuals, the comfort and the expandable aspect of the HMD.. So Im really willing to try to improve the tracking..