Excellent sound but terrible service

Urspüngliche review: (more follows below a supplement)
The device is distinguished phonetically. With good in-ear headphones, it is a good, powerful sound. BUT: The unit responds extremely sluggish. Keystrokes sometimes need a few seconds before the player responded. But sometimes it goes too fast. I have no idea why it sometimes is quick and sometimes not. What I had already several times (but not always funny enough): He can only be switched on when you insert it into a USB charger. It's annoying because when I'm out (sporty) and would then once in between listening to music does that may not, because he does not turn on. The navigation menu and within the folder is so terribly confusing and unintuitive, I have instead of navigating the microphone recording started. And since I'm computer scientist, I believe in principle with such devices to deal quite well. Incidentally, the dubbing is quite slow, but reliable. I personally do not care, I do not change so often.

Conclusion: If you only use the Player, through listening only partly filled with MP3s and always starts at one location with USB Charger, is well served by the player. The battery life seems long enough (I have not measured). For me it is usually so that I start my cycling from home and then 1-2 hours on the road am. For this, the device is, because I just still switch it on in the apartment and then just leave as long as I'm on the road running. This works well. In between, what else listen or off might not recommend the above mentioned reasons.

Supplement 12.2.2012:
By now I've settled with the device and live quite well with the weaknesses. I am also draufgekommen what is tucked behind my initial problems:
* When you turn on the player, he shows a short animation, "boots" (ie, he does something, which I can not interrupt him) and then he will briefly show the menu and turn off the screen. This is confusing, but if you know that, that's ok. Initially, I thought, he has shut down. That was a mistake.
* If you like me several hundred songs has it, you have to wait about 1 minute, until he has read all the songs after power again. Meanwhile, the machine is now unusable.
* If the device is switched on and ready he has read all the songs you can "activate" by clicking on "Play / Pause" the player, go to the Music Menu and then you see the songs list. Another push on Play / Pause can play the instrument.
* Songs in front / back no problem. I recommend explicitly not to create a folder structure and want to use these. Navigating is extremely tedious and slow if you have many songs on the player.
* The player find a track that he can not play (MP3 errors or irrtümtlich iTunes track), he simply stops playing, and does not jump easily to the next track.
* The battery lasts a long time. I go 3-4x a week to train approximately 1-2 hours and can use the player over a few weeks on a single charge.

Conclusion:
The player is basically sound but tedious to use if you have a lot of songs on it. The sound is very good and strong, according to the correct Kopfhöhrern.
I recommend the player despite the limitations yet, because he is a good, small and lightweight device is designed for people who do not want to jump around a lot in the song list. For those who want to be showered for athletes who need music for your workout, the device is super. The player is light and small. One must also be able to live with the fact that the unit needs 1 minute when switching on. So I have no problem, for example, because I always turn on the player before I start an exercise program. For these target groups, it is the right device, hence FOUR STARS. For all others: ONE STAR because unusable.