Top sound, firmware flop

Sonically It could hardly be better, the service is okay (although I would prefer a better tactile pad for a blind operation). Slightly smaller and lighter, he might be happy, even though he would probably act not quite as high.
But the firmware is currently completely immature!
The advertised drag and drop functions unsatisfactorily. Files can be easily transferred so indeed, playlists (also with correct paths) but not: the A15 has in playlists problems with umlauts / special characters, as well as the Sony Support confirmed (files with umlauts or eg "é", etc. are not displayed and all subsequent files are missing then). After several hours I had it finally still managed to transmit a working playlist on the A15. With WinAmp it did not work with Media Monkey (and the UTF-8 encoding) it has then to work sometime. This issue is thus solved with a little patience and expertise. Unfortunately, the second problem:
the A15 comes after about 20 hours in standby entirely of what indeed makes perfect sense. But if you then turn it on again, the library is rebuilt each time (which lasts depending on the memory usage for 1 minute). And then you have to re-select, for example, a playlist, which then starts again from the first track. So you have no chance, listen completely through a playlist, if you are not several times a day turns on the A15 (and thus the entire off prevented).
I had in the past few years more than one Sony MP3 players (and sometimes one of Cowon / iAudio) in use. Such problems I did not know so far ...
Very very bad and for me the reason to return the device and written down to 1 star.