Not exactly optimal - hit or miss ...?

Okay,
I have an MP3 player from Samsung (Samsung YP-Q1 (JEB: 16 GB)) and it bought that adapter.
That went well at first ... Basically:
+:
-The Unit can operate
-Low Price
-The Unit is (in theory) compatible with the Samsung YP-Q1
-The Charging times, it should work, shorter than the PC (if the terminal is ready for it)
-:
-quality Zero or under it, because:
Durability (Effective function duration) approximately 5 hours (after twice (but successful) to charge my terminal adapter was useless, gave up the ghost)
-Somit Creates a perpetual uncertainty in the buyer because the functionality seems to be hit and miss ...

Since this unit though certainly has positive aspects, but they are outweighed by the disastrous period of operation,
gets it from me 2V5 points, and the prospective buyer the Council, if necessary to ensure the longer-term and more secure power, to look for another product ...
-Ben