Runs smoothly on my Vive. Game stops tracking controllers if you enter the Steam overlay. I am picky about audio latency for these types of games, so I configured pulseaudio to disable timer based scheduling (tsched=0 in /etc/pulse/daemon.conf) and set up the fragment configuration (default-fragments=2 and default-fragment-size-msec=4 in /etc/pulse/daemon.conf). The optimal fragment configuration will depend on your hardware. I also found that I was unable to get the latency down to a reasonable level with a bluetooth headset, but that may be more an issue with bluetooth headsets themselves than anything to do with playing this game in Proton. Using a 2.4Ghz wireless headset (G930) I was able to get latency down to under 11 ms, which is excellent.