Hi Duck,
For a while I considered starting a company to do landscape lighting, home theater setups, home automation and security, and I bought some X10 goodies to play with and see if they would be reliable enough to include as something I would install and maintain. Hence, I have some extra door/window sensors as well as motion sensors. When the CM15A first came on the market, there were lots of problems with the system stalling, and the common thought was that too many motion sensors would overwhelm it. I'm not sure what the final outcome was (X10 never said), but my replacement CM15A works like a champ.
At any rate, I currently only use three motion sensors:
One is in my office where the light switch was tucked in the back of a bookshelf, making it hard to reach. The motion sensor turns on the light whenever anyone walks into the office, and the light stays on until they leave.
One is in our powder room, so when a guest walks in our lit-from-below onyx sink lights up and a small fountain turns on, making a helpful "tinkling" noise.
The last one is in the windowless media room. Walk in and a small light goes on so you can find your seat, and then after a minute it goes off.
Right now I don't use macros, as my impression is they take longer to fire a light on. What are your thoughts re: the pros and cons?
Thanks,
Rob