The app that replaces iphoto and combines it with the old Photos app...probably the most massive and overdue improvement in any Mac app I can remember in recent history...makes me realize how messed up the old handling of photos on the Mac was, actually. If you don't have it yet, I recommend that you do the update.
Not a superfan. I honestly don't like the way a lot of Apple stuff is going; I dumped my iPhone last year and manage my photos through Google+/Drive now. My MBP is the last Apple product I use.
