The selection among the weatherproof, high-performance smart phones is indeed very thin. After the Xperia Z in my opinion did not shortlisted because SOD problems, actually the Acro only remained. -And I have to say there are no glaring weaknesses of the device. Runs very smoothly, fits comfortably in your hand, because of the non-slip back. The camera, despite the rather moderate rating in good light excellent images, you must stop here as well from any mobile phone camera do not expect miracles. Of course it is not exactly a lightweight. Practically I find through the front camera face detection as a safety factor, usually works well, except in bad light, then "wiped" to halt. You could certainly philosophize about the permanently installed battery is actually a smartphone nowadays (unfortunately) not a product that you have for years, therefore, for me that is not a negative thing. On the contrary, there is a + on the robustness, the vulnerability of the battery cover is thereby eliminated. The 16 GB internal memory is plentiful, unfortunately I have not found a way to store apps on the SD card, which would be especially at locus per a great thing, if you want to store maps with relatively large files. Fortunately, the 16 GB are available, sufficient actually. Power button could be a bit bigger and valent, -was also already written. Docking station for charging is very convenient, you can z. B. Setting an alarm interface and place it on the nightstand. The LED is a little weak in the direct comparison to the Motorola Defy, but adequate. Overall, I would buy it again.