I too have a Dart. I love the way it looks. It does do a good job of keeping the air blast off the chest. I have noticed that I get a few more bugs in the face (I wear an open face helmet) as it doesn't quite direct the air over my head. I've experienced a small amount of buffeting when riding into a headwind.
For reference I am 5'11".
2007 Speedmaster w/ SS Long Slash Cuts, K&N, Polaris Bellmouth, and AI Removed
132/42/2.0 Turns Out/No Shims
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