I recently installed the 1 piece as I liked the cleaner look and it has one less seal to worry about. In retrospect, I wish I'd gone with the 2 piece as there is condensation that builds up on the inside of the glass on short rides, especially when the outdoor temperature is cool and the humidity is high. (Photo attached) The 2 piece gives you the ability, I assume, to remove the glass to wipe off the condensation without removing the fairing parts. (BTW, my mechanic says don't worry about the condensation, it'll burn off and it's simply going to happen again even if I remove it.)
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