I have this phone now nearly two years working in use, the connection to the FRITZ! Box without any problems, the processing is OK, the monochrome display looks rather cheap, the phone unfortunately is a slight noise present. Even the sound, especially in speakerphone, looks a bit dull and not come ran to my old Telekom Sinus 500. For listening to music over the Internet one has to belong to the hard-boiled, the sound of the speaker is on the lowest level, any modern mobile phone better. I have now bought the successor C4, was available for only 10 more, and has a nice color screen and an optically slightly nicer keyboard, looks thus significantly valent than the M2, has by the color display but a slightly higher battery consumption, holds without reloading but also from 3 days that should be enough, the rest of the technology seems to be the same as in M2.
My conclusion: If I had to choose again, I would pick up the beautiful C4.