I own a 120GB one-pod, but seldom use it for playing music - I have a rather nice sound system for that kind of thing. Where the one-pod really has proved indispensable is during my stays in hospital, when I've finally got around to watching a lot of the films that have somehow found their way onto my hard drive recently.
The only problem came during my last stay, when the ward nazi wouldn't let me charge it up because it hadn't got a little green sticker on the charger. It was probably the medication to blame, but I may possibly have said something uncharitable to the ugly, fat, lesbian bitch as a result.