If you want a brief comparative review between the iPod and the VAIO Pocket… in my opinion, the VAIO Pocket is better in sound and build quality and it has a more vibrant screen - very detailed and bright (just got to love a sharp presentation of your album jackets).
Sound
In the sound department, the VAIO Pocket seems brighter, more detailed and fuller than the iPod.
Size and Build
The VAIO Pocket is somewhat thicker than the iPod in size. However, not significantly bigger - you will have to see it in person to appreciate its sleek industrial design and size; it is a lot smaller than pictures you have seen online. As for its build quality, all I can say is: it is really solid and you will feel that your investment was worthwhile.
Another note of interest: if you listen to certain genre of music that requires gapless playback, ATRAC3+ is really efficient and provides very good sound quality. In addition to Sony’s proprietary music format, you can also utilize Mp3s if that is your cup of tea.
Overall, I highly recommend this portable HDD device.