The unit fits comfortably in your hand, nothing creaks or bends. The back cover is difficult to detach (beginning with the opening at the bottom corner), but that's a good thing.
The screen is nice and bright and clear, the colors beautiful, everything is easy to read even in sunlight.
The battery is charged in less than three hours and stops at economical use (some phone calls, a couple of SMS, a little Internet daily) up to five days.
The voice quality when making calls in both directions properly, my apps run smoothly, the WLAN has a decent range, the speakers sound good. The GPS (tested with Mapfactor Navigator and OSM maps, both free of charge) goes to within a few meters, absolutely comparable to expensive professional Navis. Of course you need for longer trips a power outlet in your vehicle, because GPS and screen per hour almost 25 percent consumed by battery. But this is absolutely normal.
As far as the positives, of course there is something to complain about: It's nice that even a screen protector was stuck which could also make without a speck of dust-bubble. And that the device has no status LEDs, obviously because of the very low price for the services, but I can live well with it.
Up to this nonexistent LEDs and the lack of magnetic field sensor (a compass app that I do not need) I find no difference to many much more expensive smartphones - a strong buy recommendation!
Update after three weeks: The battery lasts really long, the voraufgeklebte Screen Protector (with bubble) I've been through the atFoliX protector FX antireflection (bubbles) replaced the pleasant reduces glare. The phone continues to meet all my needs very well.
Update second SIM card: After you insert the second card, there is a new menu item "SIM Manager" in the settings and "more ..." you will find at the respective points each as the first choice, for which card to the settings wants to change.
Once you have possibly entered the necessary data depending on the provider (APN, MMS, SMS), you have access to both connections and can specify whether the calls, SMS / MMS and data connection is used each preset only one of the cards or whether one can choose each. 3G is only for one of the cards, but this can be in contrast to many other phones freely choose.
Works perfectly!