My right one worked great to start, and my left knee still does. Over the past year I could feel it slowly get worse. It feels like normal wear and tear to me, just that I used it hard with a few mouse-centric games.

I did look on iFixit but they don’t have replacements. I’m not too surprised, and I’m not really upset with Valve, because it’s a pretty new thing and they are still way better than their competition. I just hope that eventually they release an improved version.