just got two for myself last week to test. Secure inclusion was smooth, flood sensor is picking up water without a delay. For testing I also placed it on metal surfaces which was just as fast.
It has builtin temperature and shock sensors as a plus, just need to be turned on from the config.
Only issue for me so far is that the default binary sensor is not mapped to the flood alarm, so am using template instead.
While trying to figure out why, I am currently unable to expose the leak sensor’s configuration parameters. I tried using the frontend and service calls to no avail. Maybe am doing something wrong, but I like it so far. Will be getting more once I figure my config issue / update its zwcfg entry.