I just ordered a pack of the summit house branded stuff, which per my research is actually made by Hushmat.
Have not yet installed it (planning to use it on the inside of my roof before I do my headliner), but i can say from previous experience with dynamat that this stuff is at least as good as the base dynamat product if not better.
I actually think its a little thicker. Definitely a better value. 18 sheets for $99
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