For a moment I doubted whether I should return the product. In the end I didn't and after a few days of use I am moderately positive. Why? I think the holder is not the best choice for my phone (a Nexus 6P). Because the volume buttons are on the side of the device, I can only place the device below or above the buttons in the holder. This causes the device to wobble a bit, especially when touched. In addition, the holder does not fit completely in the middle ventilation slots of a Peugeot 308 SW (because there is a slanted edge in the Peugeot). The holder in the left slot fits fine, but then I had to operate the device with my left hand + there was annoying reflection from the outside.
Because I didn't see a better option (suction cup or magnetic connection, I didn't want either) I decided to keep the product. After a few days the discomfort has not disappeared, but I am getting used to it.
I can recommend the product itself. The product in combination with a Nexus 6P and/or Peugeot 308 SW is doubtful.