Similar to Mika C, at speeds above 60-65 mph, I'm having considerable vibration in the driver seat, steering column, gas pedal and visibly apparent with a significant shuddering of the front passenger seat. Severity of the vibration is related to road surface but it has the vibration on very good, smooth, new Houston highways. I just bought it and didn't feel it on my test drive because I didn't drive above 60 mph. I had my 2004 TSX for 12 years and only had vibration issues in its last few years so to have this vibration right off the bat is extremely disappointing as I am a huge Acura fan. It has already been back to the dealer for 2 days and they felt they fixed it via tire change and balancing, however it's not fixed. I'm taking it back in over the next week. Any recommendations on areas where I should ask them to check? Could the struts be malfunctioning and not dampening out minor road surface variations? Bad CV joints? Other ideas?