Used. The conclusion is: don’t believe those propaganda phrases about “super strong suction, never fall off”.
I have used different types of vacuum suction cups, but they all have the following defects:
The suction power is not strong. Although the wall was cleaned and the suction cup was installed correctly according to the usage requirements, the bracket always felt a little unreliable, and the things that could be placed were certainly not comparable to what was stated in the instruction manual. In order to prevent the stand from falling, it is recommended to place only half the weight stated in the instructions.
The location used is particular. If you want to place it in a place with heavy water vapor and oil fumes, such as the kitchen or bathroom, it is recommended not to use the vacuum suction cup holder. Water and oil will make it fall off faster. It is called "vacuum seamless", but it cannot be achieved.
So the conclusion is: Only by nailing can you feel at ease. Or just buy one that has a stand and stands on the ground.