I have the "Trekstor AluStand" ordered me, this can only conditionally recommended in conjunction with my "Trekstor Surftab Wintron 10.1" however.
The Trekstor AluStand is well made, has no sharp edges, anti-slip plastic pads etc ..... This is followed I had nothing to complain about.
The tilt angle can not be fixed or locked. However, this is not so bad because of the stable joint's because a tablet's not until barely moved this to adjust.
When using the AluStand in conjunction with my 10.1 inch tablet in landscape mode I could not detect any negative aspects.
Once I have the Tablet but set in portrait orientation in the tablet holder, tipped me the tablet including the holder at the rear. In this regard, I recommend the AluStand for a 10-inch tablet only conditionally.
As it is with smaller tablet's, I can not say because I have here to test no corresponding device.
In a test with my phone (Moto G2 -> 5 inches) of the holder held perfectly. That this is, however, of a very different size and weight, need not be mentioned separately.
Finally, I give the Trekstor AluStand 4 stars, as it is a well thought-out and well-processed article is my opinion, which is for larger devices, however, only partly recommendable.
Greeting Markus