Biggest bucket of shit. Very glad to have the Autowatch system installed.

That Brant just caused me all sorts of headaches. Would randomly cut off the engine midway through driving, and would also cause surging. Sometimes the car would start, sometimes it decided to stay put. Not to mention similar situations listed by the OP where the alarm would go off for no apparent reason.
And yes I read the manual, many times. I just had a faulty unit, and I can tell you I'm not the only one.
It was roughly the same price to get my brant fixed as it was to get the autowatch system fully installed. No brainer.