I used Noico on my car, based on several good reviews. I also used Sonic Barrier in some spots. I won some Resonix at one of Nick's shows and when I went to install it (say 1.5 years after initial installation) both brands had melted, and the rear deck would ring in spots even with deadener on it. The Resonix was a much better product. When I do the next update on the Mazda, I'll see how the Resonix has held up.
Jay