The C50T has a V-twin engine and will have some vibration due to the type of engine. I have owned Goldwings that ran really smooth. I now have a 2005 C50T and love it. I get more looks from people with it than I ever did with my Wings. About the sppeds above 70 MPH, I went to California last year and at one point we had to pass a number of trucks and I had my bike up past 100 and it seemed to handle it just fine. I now have over 20,000 miles on mine and plan to put many more miles on it.