Let me start by saying, if you're tired of your car sounding like a tin can on the highway, this GOSCHE sound deadening mat is a game-changer - especially for the price. I used it in my project car (a noisy old sedan), and the difference was noticeable immediately after installation.

The thickness (197 mil) is perfect - thick enough to absorb vibrations but not so bulky that it becomes impossible to work with. Unlike some butyl-based alternatives I've tried, this PE foam + aluminum foil combo feels substantial without adding unnecessary weight. Cutting it with heavy-duty scissors was a breeze, though I'd recommend wearing gloves - that adhesive backing means business!

Where it really shines is roof applications. In my experience, it transformed my car's roof from a drumhead into something much more civilized. Road noise decreased by about 30-40%, and there's noticeably less heat coming through on sunny days. The self-adhesive backing held strong even in summer heat (I tested this in 90°F weather).

That said, I agree with other reviewers that it's not ideal for floors. The spongy texture doesn't provide enough mass loading for really blocking tire noise. For floors, I'd still prefer butyl mats despite their higher cost and installation hassle.

A few pro tips from my experience: (1) Clean surfaces thoroughly with alcohol first - this stuff sticks permanently otherwise you'll have lumps. (2) For best results in hot environments, use some upholstery adhesive as extra insurance. (3) The aluminum foil facing reflects heat surprisingly well - I measured a 15°F reduction in surface temp on my roof.

The value proposition here is outstanding. At under $50 for 36 sqft, it outperforms many products costing twice as much. Just manage your expectations - it's not dynamat, but for most daily drivers, it provides 80% of the benefit at 40% of the cost.