I've been looking at these Tuya Smart Zigbee Ultrasonic Water Meters for quite a long time, but as they are not so cheap I have not pulled the trigger yet ...
Does anyone have any experience with these or similar devices?
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No experience, but the linked sensor's battery power with judicious reporting, and reporting when there is an alarm situation makes so much more sense than the tank level sensor with real time monitoring and a wall wart.
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I have one but I cannot get it to work well with any of the currently available Tuya Zigbee drivers. It just gives partial info. The device has a simple union jack style LCD display with a particularly cryptic menu and the instructions make as little sense as any other Tuya product. The way the instructions said to put it into pairing mode did not work so I asked the manufacturer and they sent me a video demonstrating and it was a process that has no logic I could discern and I don't think could possibly be guessed.
Also I purchased it mainly to monitor a drip irrigation system and check the flow to know if there are leaks, etc., but after using the device and chatting with the manufacturer I get the impression that these are meant more for acting as a water meter for a water company billing customers for usage or something.
Still figuring it out though. I would be glad if others started trying them do there could be more info and maybe driver development.
Maybe this is the intended use of these devices, so they are not very suitable for real-time water flow monitoring... 
Can you post your device Zigbee model/manufacturer, as shown at the bottom of HE device web page, Data section?
It's not zigbee, but Ecowitt has a sensor.. It needs a gateway, (or maybe a weather console?), but there is an Ecowitt integration. @sburke781 would know if this sensor works in the integration.
It doesn't at the moment and might need a bit more work than the average sensor.... Not sure....
Ecowitt seems to be branching out a bit of late, be it for better or for worse. This sensor seems to be weather related...watering the plants depending on soil moisture measurement, etc. I have a soil moisture sensor, but don't have the Ecowitt integration installed at the moment. Is that sensor (soil moisture) incorporated in the app?
The soil moisture is included in the EcoWitt drivers, I have a few myself, but don't actively use them.
I agree, looks like EcoWitt are looking to expand. Makes sense to me to move into automated gardening tech.
