Dynamat / Peal n Seal... yes or no

I just installed the B-quiet Extreme in my Dart. Stuff went in very smoothly.
I noticed a big improvement in reduced heat inside. For reduced noise it was just a little better than without the B-quiet. The saleperson did say add double layers of the extreme to get better reduction in noise. One roll of the extreme was $64 if you buy two rolls it was around $50.00 per roll. It only took one roll to do the floor board from the firewall to the rear seat.