My 250 Rebel vibrates like crazy! If it weren't for foam grip covers AND gel palmed gloves I really would not be able to ride the thing. Upper back injury makes my left arm go numb and I actually cannot use the turn signals. But, the stock mirrors are very sturdy and do not blur, but cheap aftermarket ones would really blur.
Funny thing, my Vulcan 500 didn't seem to have any vibration in the handlebars until I installed some lightweight Emgo mirrors. They blur really bad and now I can feel a little bit a vibration in the handlebars.
Was 2002 Rebel, now 2008 Vulcan 500