[Zammy-Sam]

I don't fully agree although your arguments are justified. I think it is much more important to have 4 devices in one than a longer battery-life. My mobility will end after approximately 16h in my bed and I don't expect my device to be longer mobil unless I have no opportunities to plug it for recharging. I think it is better to have only one screen showing your phone status, calender, song playback, video and pictures than having 4 screens. And I also think it will be a lot more expensive to have all these 4 devices bought seperately (not considering that they definitely will have a better quality) than one device.
So, I would rather like to have an all-in-one solution if I would need all 4 components. If I only use the phone as such and rarely listen to mp3s not to mention watching videos or taking lousy pics than it's a very clear decission.
But your discussion is assuming that one needs all 4 of them..