The Lightolier Compose system has disadvantages too: no individual control of loads. You can only set up scenes which all the lights in a room react to.

Of course, you can use Compose switches in X10-compatibility mode. But then, it would be more expensive than using PCS or Switchlinc switches yet less capable.

Personally, I use PCS keypads and SwitchLinc switches. The combination looks _exactly_ like the Compose system, but was much cheaper to set up. I have an ACT CR230 repeater and my installation is rock-solid.