Features
The D-NE300's simple controls allowed us to find our way around the unit's features with little fuss. The two-line dot matrix display was especially handy for viewing the names of our MP3 and ATRAC3plus tracks. Sony's G-Protection feature can be programmed to offer two levels of protection from stutters and skips when the unit is jarred or shaken. Even on the lowest level of protection, we found that only the hardest knocks could make our music miss a stride. We also liked the intelligently designed equalization features of the D-NE300. Equalizer presets called "soft," "active" and "heavy" are built in, or you can set your own levels in the low, mid and high ranges via a nifty graphical interface.

Sound Quality
In short, we were impressed. We popped in an MP3 CD and within 10 seconds the unit recognized the playlists and song titles we'd burned onto the disc. The unit delivered rich bass and clear highs, especially when we used the "heavy" equalization setting. We noticed some degradation in sound quality when listening via the included headphones at high volumes. We found the Sennheiser PX 100 Headphones to be a worthwhile upgrade.

Battery Life
It would be nice if the D-NE300 shipped with rechargeable batteries, but Sony claims that the D-NE300 can squeeze up to 85 hours of battery life out of two standard AA batteries (not included). If accurate, this is an amazing feat, and although we didn't test the unit for 85 hours, we did note that battery strength was still full after a full day of testing. According to Sony, the D-NE300 is equipped with advanced digital signal processing that helps it pull a lot less juice t