Don't think it makes much difference. I put the tape on mine, but the last time I took the windshield off, some of the tape was scootched up. Even if it does scratch the windsheild, it's below the fairing anyways. If I was to do it over, I wouldn't use the tape. The only beef I have with mine is the pouches rubbing the inside of the windshield. This creates a chaulky looking marking on the pouches/windshield where they rub. I also wish the pouches were a little bigger.
Love the heavyweights