First time owner of an iPad here - iPad Mini 3. Longtime user of Mac computers. I read a lot of PDF's and I am constantly highlighting. I bought an iPad exclusively to do reading/highlighting of PDF's. I would like to be able to highlight PDF's on my iPad and then see the highlighted marks when pulling up the PDF on my rMBP's Preview. I use Preview on my laptop because it is really convenient and straightforward for highlighting PDF's. To clarify, I am not looking for something that permanently alters a PDF document, but could be "un-highlighted" by the Mac Preview app need be. Is this possible? I've just realized neither iBooks nor the Adobe Reader app allows highlighting of PDF's. I don't understand why Apple needs to make this so difficult?