Re: Any complaints towards Nvx sound deadning
I did a google search, they aren't really well known, but from my experience, you get what you pay for.
Fatmat was cheap, but it was also roofing product and not a butyl foil faced vibration damper. It stunk and got runny.
I know people who had good luck with Dynamat Xtreme, Second Skin Audio, and Raammat. This stuff is probably too new to market to get much long term review info.