Best on flat surfaces

I have the TaoTronics phone holder now have 2 months in use and think that is a sufficient time in order to make a meaningful assessment.
The assembly is easily and simply, the packaging was adequate and not too bulky.
The holder as such can very well in width adjust and thus holds of narrow cell phones to modern large smartphones everything because so comes. That was important to me because my wife still has a slim cell phone, I have an iPhone. 6
Thanks to a ball joint can rotate the holder, in principle, 360 °. The jaws of the bracket and the pad are rubberized, so that nothing slips.
In addition, the holder can also be tilted sideways, I would say +/- 30 °, so that you can adjust the viewing angle.
The suction cup is slightly sticky and compensates for slight unevenness. In fact, he thinks for a long time but only very easily on smooth surfaces such as glass. In smooth places of Amaturenbretts (flap of the card and Brillenablage) it can be mounted, but does not keep reliable. Of course, the point at which it may be appropriate also not be too convex.