I have them and yes my mirrors vibrate , the Heli bars are longer so the vibration will be worse than stock bars . I put some Ground Pounder bar end weights to see if that would help and it did a little. At first it used to bug the heck out of me but now I'm kind of used to it. A few things you can do while riding to see better , pull in the clutch and let off the gas for a second for a clear view and another thing I found to do is to use my right hand and just hold the stem of the mirror to steady it for a quick look also.
My little tricks really are just a solution for a quick loo to confirm what your seeing behind you like a cop car or to make sure all your buddies are still behind you.
My mirrors vibrated a fair amount before doing the bars as I came off a Goldwing and they are as steady and clear as a cars mirror, so they have been bugging me for almost three years now. I was told the vibration at certain speeds / rmp's will always be there due to the engine .
2012 Cross Country Tour
IBA # 33520 - 1040 in 24, 04 / 2008
1036 in 24, 10 / 2014
Michelin Primacy Alpin PA3 ZP 195/55/16