I was on ebay last night and run across a windshield for a GL1800 called Optic Armor and went to their web site Optic Armor Performance windows and clicked on Motorcycle link and it went direct to F4 web site. It appears they are the exact same windshield. The cheapest I have found F4+4 is about $350.00 and these are on ebay for buy it now for $279.95. Has anyone heard of this company before and are the windshields the same as F4?...A nice savings if they are the same.....Any comments would be welcome...