davis 1221
FWIW
My experience with X10 has been IF it works "out of the box" it will continue to work satisfactorly for years (PLC stuff only, I have no cameras, etc.).
One exception is the wall switch module(s). The push ON push OFF switch is not the best design. I have gone so far as to replace the switch with a push button.
On the plus side; I have several Lamp Modules and one old "toggle" style wall switch module that are pushing 25 years old.
The statement of fairly good reliability, excludes the ubiquitous phase coupling and interference problems which really are separate problems outside of X10 Inc's control.