I had a Dart screen on my 2009 T100 until this weekend when I replaced it with a Triumph summer screen.
My reason was because the windblast and buffeting at anything over 60-65 mph for two or three hours was really tiring. I wear a Shoei TZ-R helmet and good earplugs but it wasn't terribly pleasant. Now, at speeds below that it was just fine, around town it had no effect other than looks.
The biggest reason I replaced the Dart was because of the experience of riding a Tiger 800 for a weekend. On the Sunday, I rode from 10 am till 4 pm at mostly highway speeds, 50-65 mph and didn't feel nearly as fatigued. The larger screen reduced the windblast enough to make it very enjoyable.
I did an hour long ride with the summer screen with and into about a 10 mph wind and the experience was excellent. I could still feel the wind around me but I was shielded enough that I could have my visor open at 40 mph.
And this may sound strange, it felt more stable when passing large vehicles. Could be just me but The bike didn't feel like it was moving around as much.
For reference, I'm 5'9" and ride with stock bars and stock seat.
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