Could not be recommended

Together with the Smart band SWR 10 in black I ordered the SCR24 cover for my new Z3 mobile phone.
Unfortunately I have to return this because it does not begin to meet my expectations.
First, however, the positive things:
Ordered on Prime:
Delivery within 48 hours
Top packed
Cheaper than in the online store of Sony!
To cover itself:
Positives:
Through the window I can see some important information without opening the envelope (but should press to the "On / Off" button.
I flap the jacket on, the screen wakes up automatically, I close the shell, the phone is locked.
The interior of the software was, thanks to NFC, very easy.
I closed envelope accept and photograph a call.
The mobile phone can be loaded over the magnetic connection with Case closed.
More positive not think of me.

Now the negative side and the reasons why I will return the envelope:
The shell is very fast dirty, it attracts dust, especially bad is it with the viewing window, from the outside greasy by the finger, from the inside it is also slippery, alone when held in the hand (and I usually clean hands).
The inside of the viewing window transmits their "pattern" on the screen of the Z3, there is a short time the section of the window can be seen clearly.
Protection does not provide this cover, because the edges are exposed.
Held the envelope which merges via a membrane with the back of the phone.
Unfortunately you have to align the phone several times until it is seated properly, it will therefore resolved before the first use several times and re-attached.
Also very negative I noticed the following, but I'm not sure if it is due to the shell or the smart band SWR 10:
There is, since I have both actively, repeatedly "hanger" in the system.
For example: I play a simple game, Sudoku or Candy Crush.
Usually it runs as usual, suddenly nothing works, the phone does not respond to my input, after about 5 seconds, it is addressed again ...
All in all, I expected more quality of Sony, I can not recommend this envelope.
I'm going to order me another, quality leather case, this may cost a little more happy, but then should also protect my phone properly and be well made.