I was really impressed with my front K-60 -- I have to ride at least 1 mile of dirt roads to get to work. 3 miles if I take the short cut. I just have the front and it feels more stable -- The highway noise is a minor thing to me -- I would buy them again. Revzilla is a site sponsor and I would recommend you use them.
Let me know if there is anything else I can tell you about them.
2012 650, Centerstand, lower cowl, accessory plug, grip protectors, hot grips, fork brace, mirror extenders, crash bar, auxiliary lighting front and rear, madstad, California Scientific medium windshield.