I am curious if anyone has the same problem that I have. I just bought a 2010 Prius II in January 2011. I have to slide the driver's headrest all the way down so that I can check my blindspot when driving. What I find absolutely irritating is that the stupid headrest vibrates upward so that I can not check my blindspot. Everytime I slide the headrest down it vibrates upward again. I swapped out the driver and passenger headrest and this continues to be a problem. I took my Prius iunto the dealership and explaind the problem and they said they were unaware of this being a problem. I asked the dealer to swap out my headrests with two new headrests and the problem continues. My next step is to tell the dealer to replace the entire driver's seat. Id anyone else aware of this or have a problem with the driver's seat headrest vibrating or sliding upward on it's own? Thanks!