I have 7+ years of experience with multiple valve automation types. I started with a Z-Wave DomeHA Water Main shutoff. Fortunately, I never had experience with "all on" issue. However, as a strap over the pipe and clamp onto the actuator type valve closer there was always a wee bit of play in the valve closing process. Sometimes when I attempted to close it would remain what appeared to be a slight bit open. The regular issue I encountered is unrequested shutoffs. No water sensor was tripped no request sent. Just decided to close. I admit that "failure" is much less concerning than unexpected opening of the valve. Either way it was enough to erode confidence in a Z-Wave device.
Consequently, I shifted to a hard wired (24VAC hard wired relay), price was 6-10x the price of the cheap valve actuator and I had to pay another couple hundred to have it plumbed into the line. But you know the saying, you get what you pay for. The Elk replacement was one of the best moves I've made in my system. It's completely bullet proof. I've ever had a failed close, I've never had an unrequested open. It's truly amazing. If you can't afford a hard-wired valve controller you might wanna make sure you have a low insurance deductable, cause all it will take is one flood claim to make you wish you'd put in something that will really work, and work FAST (current versions close in less than 1 second).