This is the third click lock floor I’ve installed over a concrete slab in my home. For the first two I used the cheaper semi-transparent foam muffler that gave the floor a dull sound when walked on. For the last job I used 5 rolls of this more expensive muffler hoping to get a floor sound that simulates solid wood when stepped on. The results are mixed. For the first two jobs I laid the muffler parallel to the wood, one piece at a time as I worked across the floor, and had no problems. For the last job I followed instructions and laid the muffler perpendicular to the floor, which meant I had to lay it all before starting the flooring. That turned out to be a significant problem.
As many have already said, the expensive muffler tears easily. I scuffed it with tools, knocked holes in it when setting wood sections in place with a tapping block, cut it while moving wood secions, and even punctured it while walking on it with tennis shoes. Catching the seams with tools, boards and my feet was also a continual problem. Although I taped scuffs and holes in the muffler with clear packaging tape, the end product probably had no more barrier integrity than the cheaper muffler laid parallel to the wood boards.
The final product has a walked on sound more like a solid floor, but it turns out that just means noisier. The floors with the cheaper muffler now sound pretty good in comparison. All in all, I’m not sure this product is worth the premium.