I just finished installing their damplifier product a few days ago. I'm lazy and still haven't put my passenger seat back in, so there are two holes in my floorboard with no bolts in them. But it seems to deaden random noise and vibration pretty well. I'm happy with it.

 

How much did you do and what package did you buy?

 

I got 80sq ft and did both doors, the floorboard, and the back wall.

 

Nice, I am about to install 160sq feet into my Yukon with Damplifier pro. They have one of the greatest customer services and highly recommend them.