Maybe people are talking about different versions of button flies, by all of the ones that I have seen have like 4 or 5 buttons, which are by no means easier to use than a zipper, the buttons are along the entire length of where the zipper usually would be, so I don't really see how they can be easier/quicker to use than a zipper.
These pants are just one thing that always amaze me whenever I see them.
Well I am speaking on behalf of the males... not sure how females feel. But my main issue is that it is annoying if you have to access components behind the fly region. Girls maybe this is not such an issue because other actions are required to use those services. But for men, it is useful to be able to have just the fly section open. (and the buttons make it a PITA)
I think my 501's use button flies.
Why on earth would anyone like this? It make it so much more difficult to just ... do certain business. A zipper is much more efficient. Everything else about this pair of pants I like, but a button fly? Are you kidding me? Forget it.