I haven't made the transition to Photos on my Macbook, because I wanted to ask a few questions that I haven't seen answered elsewhere. 1. I have thousands of photos and hundreds of categories that organizes them. These categories are mainly based on who they are photos of. When they were taken is irrelevant to me. Will photos maintain my current iPhoto categories after the transfer? 2. Due to my large number of photos, I divided them into three smaller iPhoto album sets so I'm not waiting for the app to upload everything at once. Will I have trouble transferring all three of my iPhoto sets to Photos? 3. What happens to the photos themselves when they are transferred? Will I have two copies of each photo in each app? If I like Photos, is there a way to smoothly delete iPhoto and all the data stored inside of it? 4. My understanding is that the default setting in Photos is to convert imported photos to poorer resolution. Is there a way to prevent this so all imported photos have their original resolution?