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Some will use it and some won't and as for the folks who are anti-Mac, and seeing the sillyness of Windows 8 - many more Win-users may jump to OS X sooner rather than later.
Folks want simplistic, intuitive and solid-state - and Mac/Apple delivers all the time.
and we're going from $99 to FREE - so who would really complain.

the comparison to Dropbox is fair and I would have concerns dropping this data all around the world on PC's, just the same as my iCloud data.
For many though, this will revolutionize storage and backup options for many a normal (non-techie) user who won't care what's proprietary or not.