Image credit: Rock Paper Shotgun I know I don't have the best knees. My body informed me of this during a drunken dance-off in a Leeds night club when one of them popped out of place and tore a line through the back of my knee cap. It told me again a year later when I did the same thing playing frisbee. And a third time when I slipped on some grass while walking Jeremy Peel's dog on a rainy day. Put kindly, they're shoddy. Yet, I'm developing a whole new appreciation for their shoddiness while playing through Half-Life: Alyx , Valve's VR spin on City 17. I've had an on-again off-again relationship with VR headsets since the days of the Oculus Rift. I'm both fascinated by the tech and the experience of being within a virtual environment, but often running up against the discomfort of wearing a headset for a long period of time over a pair of thick glasses.…