well guys I bought some of the BQuiet stuff and was not impressed. it was about 1/3 the thickness of Dynamat and just had a "sticky" feel to it all around and very flimsy. I ended up selling it and using dynamat all over. the adhesive side was not as strong as the dynamat either, so I was hesitant to use it on the headliner area.
I have had the dynamat on my truck for over 2 years and was a daily driver in the heat and snow and no problems with adhesion or anything at all.