Good quality for the price. Better to be used along with other types of treatment.

Excellent.

I bought some acoustic tiles a few years back from Monoprice. They are the grey colored ones in the photos. I was hoping to get something similar but sadly the new ones they sell are not as dense and well made. Granted the "peaks" do measure 2" but overall dimensions are NOT as advertised. They are only 11.5" x 11.5". Kinda sucks when you're soundproofing a 36" wide door as you come up short. Naturally made in China.
Don't expect full on "soundproofing" from these but they do help in volume reduction.

These are ok for the price just make sure you buy enough of them and have a way to attach the panels. They have no adhesive on them.

When I installed these, I noticed the damping immediately.

These are acceptable pads for certain applications. The foam is slightly thicker than the 1 offering on Monoprice but the build quality is still questionable. Im using these above my mixing console to dampen the sound. Keeping my fingers crossed they do the jon

It's exactly what you would expect and the foam performs exactly how it should. I left 5 out of 5 stars; because I'm satisfied with how it looks and it made a huge difference acoustically treating my room (I used them with acoustic blankets). The angles are deep and I think it's a beautiful design compared to other companies. Good product, it's not flimsy. I bought two dozen and every panel was produced well/checked properly. I bought them 'on sale' and I believe it was a fair price.