CZ is about 15 hours of 128k mp3. However, samsung’s YP-U5 YP-U6 YP-U7 is 20 hours and YP-F3 is 15 hours at the level. And YP-F3 is color sweeter than CZ plus all U5 U6 U7 F3 have SOUNDALIVE effect. If playing OGG Q6 and above, playing time will be cut down much more. Maybe 2 days one charge and that’s not convinient.
I think sandisk mp3 may not develop a new music effect system, but Hope sandisk mp3 will make longer playing time.