I just put on a set a couple of weekends ago, and love the difference. One thing, though: I found I was getting a booming around my helmet that I had not felt or heard before, and at first I thought it was the handguards at fault. After some experimenting, though, I discovered the real culprit - moving the lever brackets in to accomodate the handguard mounts! Air coming off the (now more closely spaced) mirrors was causing the turbulence; fortunately, a set of mirror extenders brought everything back to normal easily and cheaply.
YMMV, but something to consider as you install them. Enjoy!
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