I bought these along with Neumann KH120a monitors. It stays on top of my homemade wooden monitor stands. Since my desk and the stands are wooden, my desk was rumbling a little without this pad. The rumble wasn't something that kills the sound in the room but every little detail helps, especially if it is this affordable.
The foam is well made, not even a little shape deformation occurred in 6 months of use with 6.2kg monitors.
The angle fits my workspace perfectly by directing the tweeters towards the sweet spot, which is a nice improvement in my setup.
The looks are ok.
Pros:
Cheap,
Durable,
Good quality
Cons:
The thomann sticker came out as soon as it came out of the box.
Not the most handsome item in my desk but still can't complain with this price.
In general, if you need to uncouple your monitors from your desk/stand/floor and give them a little angle, buy them.