While I don't own one of these yet, I found Geico was far cheaper for me for reasons I don't understand. I'm in my mid-40's with a clean driving record and Geico was about 1/2 the other quotes for full coverage on my KLS-250S.
My '04 RC51 costs $30 a month to insure, but that's liability only. They know that with a big bike, when you go down, you're goin down. '80 CB750 $8/mo. '75 CB125 $5/mo. Uhh...that's all I can say about bike insurance.