2020 harley low rider-so, takes wind off of head and chest at highway speeds but wind will still be on arms and shoulders. at 70mph, fine. 75 on up--a little pushy as you go up/cross winds. same as on my triumph bonneville. no buffeting-the shoulder/arms wind comes from being narrow, i think. i have tried the marlin but do not like it bc of buffeting on both the bonnie and low rider. my sugestion to dart would be to make a wider model screen. i bought some amazon cheapo wind spoilers i used on a 1/4 fairing on another bike. i think they will get the wind off the arms and shoulders at higher speeds. despite my quibbles, after having spent lots of money on different wind blockers on multiple bikes, i think the dart screen is very effective for the price. since most of my miles are commuting at US highway speeds, i do want more wind off of me. but for my weekend, rural road, 70mph or less riding, the dart is perfect.