The amendments aren't strictly necessary - they're helpful, but you should call an airfield before you depart anyway, and hopefully they'll tell you about any changes.
But I like the one in the binder because I can remove individual pages and clip them to my knee-board, which is much easier than trying to work from the full book when flying.
(Of course there's nothing to stop you photo-copying the page you want and clipping the copy to your knee-board, but it's not quite the same somehow. Besides which you can't photo-copy a page if you need to divert in-flight!)
At the end of the day, though, I think it's just personal choice.
FFF
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