Mounting even a single wall with these panels makes a great, audible, difference. They look pleasing to the eye and fit in well with TVs/monitors and more modern furniture to create a more refined look.
The dimensions are as advertised and the product comes very well packaged thanks to it's overlapping design.
There is a faint plastic/polymer smell, that is common in most similar products. The smell fades in a few days time.
I would consider these panels a safe, but very effective, choice if you're looking to line your walls with some sound absorption.
I can really recommend these.
PS. Don't forget to get the contact glue, if you decide to buy these. I made the mistake of trying with alternative methods. I did not have any success...
Also, you need a cartridge gun to easily use the t.akoustic contact glue. It can be used without tools, but it's significantly more arduous and most likely not worth your time.