I am about 6ft, 32 inseam & went with the 24 in clear. Like the previous posters, it made a huge difference over the stock unit. The wind flow just hits the top of my helmet & my shoulders. I also went with the CeeBailys side wings, which I installed at the same time. I now have a huge quiet pocket of air. Quiet like being tucked in tight to the stock shield but sitting upright in normal riding position. I will still be wearing ear plugs though. It will be nice during the colder months here in CO. Not sure about the summer time, even though it was 70 yesterday. After my first ride yesterday, it will take some getting used to looking thru it on steep uphills & downhills. On flat ground I'm looking over the top by about 3-4 inches. Side winds are more noticeable but I would take a little bit of side wind disturbance over the buffeting/drafts/noise of the stock shield anyday. I also noticed that I don't have the wind gushing up under my new Arai Signet Q helmet anymore. I too can ride with the face shield up at speed now. I am very pleased with overall performance of the shield. More time in saddle will confirm.