This $100 gadget is nifty -- early birthday gift from my hubby who researched it and saw glowing reviews, including from DC Rainmaker!
I'd pretty much given up on trying to do Zwift running, short of spending $$ on a Stryd pod or upgrading to a smart treadmill. I couldn't really get my Apple Watch or Scosche Rhythm 24 armband to work reliably for HR and speed/cadence. This thing seems bang-on accurate for speed. In theory it might be able to read cadence, but I think it likely depends upon where it's positioned alongside the belt (we set it up way at the back where there's a perfect flat/smooth spot away from where I would errantly kick it). I'll likely just wear my Scosche armband for HR and cadence.
And now we're guaranteed to have an early Spring.