The WiFi part of it requires an extender even though regular WiFi works with cell phone in same area.
Piping & valves must be totally redone if 23 yrs old as requires 3 separate zone valves & old system is 1 solenoid valve with 3 zones.
New PVB valve is also recommended.
It functions as advertised. It is very easy to install and setup. It links well with my android phone, and the app has a very intuitive user interface.