I take my faceplate off when I'm at school, go to a bad area, or overnight at my house. That's for my 9855 I'm using in my truck. My neighborhood isn't bad at all, but I know of a few people who live around me who had their cars broken into. I figure out of sight out of mind. With my car and my 800PRS, well, that sits in the locked garage all of the time and my alarm is armed. The faceplate usually stays on. If I take the car out, it will depend on the area in which I park as to whether or not I will take the faceplate off.
Here's a question:
When you take the faceplate off, how many of you leave it in the car (glovebox, center console, etc)?