I just had a Fortrezz shutoff valve, and flow meter installed. No problem including them and creating devices for them. The flow valve on/off control works fine, though it shows 'off' when the valve is open., 'on' when it's closed, no biggie.
It doesn't look like there's a device definition for the flow meter yet. I clicked the 'submit to indigo' button in the device's config tab a little while ago to provide the details. Currently, the only thing it reports is temperature (of the flowing water). Anything else needed from me to get flow data working?
Thanks, Joe