I have one 10A sensor, 15 12As, two motion detectors, two alarms plugged in and three lamp modules synced with the system. The house is two story 48'x28'. Not recommended, but I've been using generic drugstore batteries which I did replace before leaving for the children's homes at Thanksgiving (six month change as I believe is recommended). I really only arm the system about once/month but I check the console continuously for zones that are out. Has pretty much been perfect for months. What I've learned: Yes, this system can be frustrating. I suspect the sensors do not have equal signal strength. What I had to do is move sensor #x to location D, sensor #x to location G, etc. Another observation is sensor position. They really do seem to have to be vertical, even if they are upside down. After changing batteries, if it doesn't go smoothly or takes longer than 30 seconds, just leave them out for several hours and reset the zone.
I keep reading about extending the 1200's antenna. How do you do that? Another question, once the condescent bulbs are gone, what alternative do we have with modules to flash the new bulbs?