Hi..i am a new user here. I personally don't know how well the Strafe w/ MX Silents sold, but if for some reason the sales were bad, I'd say it's probably more of the Keyboard Design than the switches.The K65, K70, and K95 are such well put together keyboards, it's kinda hard to make something new, that is also better.The Strafe is just missing a few key features the K series offers.
When those switches were announced I was really excited, but then they ended up not being on the right board. I've waited ever since their release for them to come to the K Series, but they haven't.