@Simpler you should consider shipping a couple free test samples with express to @GavinCampbell from the HomeTech.fm podcast (who just recently started his own YouTube channel called ”Gavin As A Service” as well) if you want an independent honest review of it, as listening to their last few years of podcast episodes it seem he have a really specialized in testing soil moisture sensors within the smart home niche, (though from my understanding he is only testing Zigbee devices with Zigbee2MQTT and not ZHA would not be representative to all Home Assistant users. Also be aware warned that one constant feedback he had to all manufacturers is that he personally wants a model that sits flush with ground so that he can use it anywhere in his lawn without lawnmower damaging it).
Anyway, I bet that it would be a good idea to also send free test samples with express to many smart home YouTube:ers that do independent products reviews of smart home tech to test and show if the device is actually any good, but I see that there is not a lot of time left for that now so you might be out of luck if you did not plan ahead for that before.
Regardless, you would probably want to get trustworthy independent reviewers showing of tests your devices on all or at least most of the popular smart home ecosystems with feature Zigbee gateway, and here on Home Assistant that deffinitly includes the built-in native ZHA integration (because that what most Home Assistant beginners start with and what many continue using if they have the official ZBT-2 adapter as their Zigbee Coordinator.
PS: @Simpler by the way, with your device being based on Zigbee a tip is to copy the essence of my Zigbee optimization guide for best practice tips for you FAQ on preparing for best possible experience and to avoid the downsides of the Zigbee technology, check it out here → Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
PPS: @GavinCampbell should make yourself read that guide too as I listened to you and your fellow HomeTech podcast co-hosts struggle with Zigbee devices yet I got the impression that ya’all do maybe not fully follow or are even aware of all those optimizations and best practices for Zigbee! 