Even the GPS reception is now acceptable (after 10-40 seconds = 7-9 = stable satellite reception).
The signal strength of the two SIM cards is particularly in closed spaces even slightly stronger than in "my S4".
The wireless internet service is at least as good as with "my S4".
The screen is perfectly adequate bright touch-sensitive with good contrast and pleasant, the writing is clear and legible.
The processor seems to be perfectly adequate. So far I have not found any trailers / stuttering.
The RAM is also sufficient. I have already installed over 60 apps, including navigation apps and so far have had no problems with it. For compute-intensive games so far I can not make any statement.
When internal memory only 1.66 GB are displayed.
Much to my surprise my 64GB (Class 10) Samsung micro SD card has been accepted (with 58.54 GB - formatted Fat 32 from your phone). So the apps start even faster and thus is ample disk space available. The apps can be almost any move to the SD card.
When loading web pages or email etc. I've noticed no significant difference to "my S4".
Everything goes fast and smoothly.
The battery life is also perfectly adequate. I am so far come always good "on the day".
Only the camera (understandable given the price) is not "top".
For good illumination acceptable in poorer lighting little choppy and blurry unsteady hand.
To evaluate the price / performance ratio is a strong buy recommendation and of me with 5 stars.
Note: Screen is not so secure from Gorilla Glass ... quickly screen foil
(My tip: Vikuiti DQCT130 fits perfectly)