I've used it for several years on a BMW and now use it on our VW convertible. It keeps the rubber soft much better than armor all in my opinion. I have not had a problem with it leaving a greasy smear on the glass.
Most of the time the noise is caused by dirty rubber and felt. try cleaning the surfaces with the windows down and able to gain access to the areas that touch the windows. any spray stuff can attract dirt and ruin windows that have tint.