Battery usage is a big issue for me.
Also, I use my 5.5G for video, which, as I understand it, is not smoothly or natively supported by Rockbox (though if I'm wrong, I'm wrong). Overall, I like the way iTunes works, and I like the way my iPod's native OS works. Also, I have some itunes downloads that won't work under Rockbox--though this wouldn't be a deal breaker. Finally, I really don't like Amarok, Banshee, gtkpod, etc. -- I don't like how they manage my collection...at all.
And while I'm thinking about it: most of my collection is in aac, and I'd like to stick with it, if only because of momentum. Not about to flip over to ogg, though I have nothing against it. The iTunes AAC encoder is pretty much the best consumer-level aac encoder out there, and moreover, FAAC-encoded AAC's have all kinds of compatibility issues...namely, the aac files that it produces don't have a quicktime envelope, and so aren't compatible with itunes or ipod (or something like that -- either way, faac aac's don't work in itunes)
I'm just plain happier with the closed-source itunes and ipod os.
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