I have had low bandwidth for most of my life and apple update has been a pain for the huge size of even point update. I actually haven't used offline download.

I have had low bandwidth for most of my life and apple update has been a pain for the huge size of even point update. I actually haven't used offline download. My biggest pain point was that the downloader portion of the updater is so low quality. It corrupts downloads or restarts with tiny network blips, can't resume most of the time and often much slower to download than available bandwidth (that might a bad routing issue on my country). Overall it's often a painful experience.