I had some custom door panels built for my car, and while they were being worked on realized the factory vapor barrier was in very poor shape. After some looking around, I decided to give this stuff a go - it gets favorable reviews from professionals against much more expensive products - like "90% as good as Dynamat for 50% of the price." Since I don't care so much about noise and was mostly trying to address missing vapor barrier, it seemed like a good fit for me.As I'd been driving around for a couple months with no trim on the doors, I really can't comment on how well this stuff does at sound deadening. The interior feels quieter than I remember, and the doors closing seems even more solid than it did before. But it's just how I feel, I don't really know.What I can comment on is that's very easy to work with. The diamond pattern gives you slack to deal with non-flat surfaces pretty easily, and helps you know when it's been properly rolled down. The foil layer is ultimately pretty thin, and I had no problem cutting with a sharp utility knife. The only installation issue I ran into is that in tight corners the rollers had a tendency to slice or mangle the foil, but after doing that twice I change my approach and had no further issues. I found with a light touch the mat could be placed and then removed, but once it's pressed down - even by hand - it's not readily coming off. I left my doors open with the mat applied for 5 or 6 hours to be sure it wasn't going to fall down, and it was very clear it was staying put. The 80 mil thickness seems like a good place to be - thick enough there is some mass there, but not too thick it'll interfere with trim going back on. Good choice there. Next day I can detect a *slight* smell from the rubber if I really try, but nothing I would describe as I problem and I am VERY committed to neutral smelling cars.I will log some miles with just the two doors done, but with quite a bit left over I will probably throw some in the rear quarter panels and the roof as well, then maybe I will have a sense of how it performs as a sound deadener. I've worked really hard to shed weight on this car so I'm hesitant to grow back even a few pounds in sound deadener.... but it's for science, right?UPDATE: Following good results with the doors, and having a substantial amount left over, I decided to apply this stuff to the doghouse cover of my older motorhome. The cover is just fiberglass and carpet, so there is a ton of engine noise and heat that makes it into the passenger compartment. I used a fair amount of the Noico, and sealed joints & unions with their "special" tape to ensure the rubber didn't get squeezed out or ooze onto the engine.2000 miles later - including several passes over the Cascades - I can say that this stuff has dramatically cut down on noise, but also improved the heat situation. It's now possible to have a conversation at a reasonable volume while cruising down the freeway. These mountain passes are about worst case scenario for engine heat, and the Noico stayed put and there's no indication of problems - the picture is *post* drive. This isn't exactly analogous to a car since there's a 1' air gap between engine and cover and substantial air flow, it's still putting up with some pretty direct heat here. Cool!