Okay... on saturday I pulled apart my brakes and put the stop squeal goo on my brake pads... Ive been on a cruise and also done a bit of driving over the weekend. Both hard and soft. I will say if you have problems with squealing brakes, go buy this stuff. Its red and can be grabbed from your local automotive shop (ie. Repco, Supercheap etc), think it was around 10 bux... there abouts.
I have had little to no squealing.. Every so often i get a quite faint, soft squeal, but other than that... nothing. So I think it seems worth it.