My decision to buy an iPhone came about not only through really wanting one, but because family and friends used to complain that I was a nightmare to get hold of on my mobile phone.
My iPod touch was always on me and always kept charged, but my mobile phone was invariably left at home, never charged, or ended up ignored as I listened to my iPod.
With this in mind I decided to combine the best of both worlds, and already people are happier they can get in touch easier because it's hard for me to miss their calls when I'm listening to music at work or out and about.
I'm also one of these people who is happy to chop and change my music/video content, and being honest I can't understand people who do relatively short commutes to and from work, but load a 32GB or 64GB iPod touch with 10 feature films bought from iTunes.
My Uncle is one of these people. His music collection is around 9GB, but he owns a lot of movies both bought from iTunes and ripped from his own DVD's via Handbrake. His commute from work is literally 10 minutes at most, it's three stops on the local train line ... yet he feels the need to carry around all his content. He also can't use his iPod touch at work because he works in retail, whereas I work in an office and use my iPhone to listen to music a lot during the day. It's bizarre, and I for one don't understand people who use their iPod for small commutes and nothing else, loading every piece of content onto their device.
Me personally, as long as every single Metallica album (studio and live) is on there ... I'm a happy man. I rarely change my iPhone playlist, even though my iTunes music library is 14.85GB in size. If I do feel like a change, then I change it before leaving for work, and I very, very rarely put a movie on there unless my wife is driving us up to the North of Scotland for a visit to the family, which takes over 2 hours.
Maybe people feel "justified" having all their content with them, knowing it's all at their fingertips. But I feel when the opportunity to use all the content, especially feature length movies, simply isn't there ... it's kind of embarrassing.