Starting with the bad news ...
Unfortunately I ignored the negative reviews on this product (1 to 3 stars). I have now also found use after 3 days Similar problems. The approximately 3 cm wide feet of the notebook push slowly into the soft material to. If I had not paid attention to the impressions of feet, my laptop would have also had heat damage. Thanks to the critics in front of me, who described the problem!
The good news ...
My friend has the same shelf for years and is very happy with it. He has a much lighter notebook with wider feet, which makes the impressions of feet into the material.
In addition, the increase of the screen, especially for the back, very pleasant. Also on the couch or in bed, the product proves to be very handy. Therefore, I will be a non-slip and pressure-resistant material get me (rubber mat or similar) at the hardware store, I can stretch / put on the shelf.