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What does it mean when they alk about windows having reverse polarity? Both Clifford and DEI talk about it. I was looking towords either the Intellguard 7000 or 8000...do you have a prefference for either and what would it cost? If i am going to spend $$ to protect my car I want to do it right the first time. As for convenience over safe I would pic security any day. No sense in your car being convenient if someone else decides they want it more than you do.