I bought the X10 Protector Plus in Sept of 2008. $259.96 for the system and add ons that I purchased.
In a word, it's JUNK. I have 6 motion detectors, and two of them give false alarms constantly. So in the middle of the night, I'm jumping out of bed to go downstairs and check - you have to go check just in case. When I sent in a question to X10 thru this website, it took almost 6 wks to get an answer. I called in, and some 'dude' that sounded like he was half asleep told me that I might want to change the batteries....that were, at the time, 4 months old. I also changed the setting on the back of the detector so that it would not be as sensitive - nothing changed. Still getting bounced out of bed at all hours of the night.
Not only do the detectors give false alarms almost constantly, but the support has been abysmal. Don't waste your money on this system. Just because beautiful women are scattered throughout their catalogs, that certainly doesn't mean the product is good....just look at the women, but go somewhere else and buy a real home security system, not a toy....
I have never been so disappointed with a product.