I very much doubt that there is a better MP4 player available on the market at the moment and if there is I'll bet the screen isn't as big.
I bought the 4GB version in black and was surprised at the list of features it contained, especially considering how reasonable the price is compared to other players that seem to only do half of what this one does.
I've stored a couple of movies on it for the long commute to and from work but I use it for more than leisure, it also helps me with business. I can test company podcasts on it before they go live or, using the built-in memory card reader, I can transfer company despatches and other documents onto my D2 and proof-read them with the text viewer and the record facility let's me dictate corrections for my secretary to deal with the next day.
I'm considering taking a week off so I can play with the mp3 player side of it and the DAB radio but if they are anything like the rest of the features they're bound to impress me.