I have the PSP charger too and highly recommend it. Since the 505 wants an active computer on the other side (unless you hack the USB cable) you have to go through the re-synch on disconnect when you charge by USB and you can't do anything with the reader while charging.
With the PSP charger, on the other hand, the reader can be used as usual, it charges pretty fast, and there is less wear and tear on the USB port. Wins all around.
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