Great article! I experienced two of the four issues above when I was on Mavericks and was debating whether to move to Yosemite... Those popup messages annoyed me enough that I moved one of my MacBooks to Yosemite. It is a good thing that I left my other Macbook alone - the one that I use for my consulting work...

And thanks for the tip about "saving as package" - now, I can save my iWork files so I can at least open them on my not-so-old-but-ancient-in-apples-view Mavericks OS :)