The S50 does not have the criticisms of B15Q, which I described in my review there (except for the screen). At S50, the GPS receiver is much better. The battery lasts many days, with little use (always with me in airplane mode, since I almost never on the phone). However, this is permanently installed and can not be changed. Exactly this point leads to the devaluation, because actually I do not want to dispose of the smartphone after 2-3 years (especially at this price ...).
I use the CAT PRIMARILY hiking, geocaching, to navigate the Internet and on vacation. Furthermore, I have some installed on software (eg astronomy programs). In contrast to the much more B15Q ROM is available, which is important in the newer Androidversionen and its SD Card Management. However, the display reflects very strong.
I find it a little bit more cumbersome than the B15Q. Although it is thin but quite high and therefore not as "grippy". Does not matter, I am not yet fallen :-).
Any software that I use runs smoothly. All in all I am very satisfied, only the non-removable battery is an absurdity. That's why only 4 stars.
