Yup, Zooz S2 Stick 700. I had an 800 around that I tried first. When it didn't work I figured ISY didn't support the 800, so yanked it and pulled the 700 that came with the Polisy out of it's box.
Hmm, I thought I saw something about NOT updating FW in the Zooz, but not recommending it. Thanks, I'll dig!