Quote from the review:
“So, what do I think after using the Sony Network Walkman NW-HD1 for the last couple of weeks? I think that I need to finish ripping every CD I own, just to see how many it takes to actually fill this device! The Walkman is small enough that its no bother to bring it along when I go out; it easily fits in a pocket or my bag. The battery life is simply amazing…truly! This player is so easy to operate that I didn’t need the manual.
With this type of battery life, I am not even worried that there isn’t a car power adapter available. I am a little concerned that there may never be much in the way of aftermarket accessories if the Sony doesn’t catch on with consumers, but since there isn’t much I would add, I am not too concerned. One future future improvement I would like to see, even if it meant a slightly larger version, would be the addition of a buitl-in FM transmitter. “
Found VIA Engadget