I started off on a PC many years ago with Lightroom. Two years ago when I moved from PC to Mac at home, I stayed with LR. But now that I am using more and more of the apps in the Mac ecosystem, like Maps to put GPS on old images, I want a Mac friendly photo management tool. So yesterday I purchased Aperture from the app store, and imported 56,002 images as referenced files (the originals stay where I put them using LR). The older files from the 90s and early 2000s were jogs that gave no problem. Aperture also imported all my DNG files that had been created from Canon CR2 originals. My Olympus E-M1 raw files that I had converted to DNG were a problem. So the few of them I had were exported as TIF and Aperture could bring them in. The last couple of days I have been importing my E-M1 raw files into LR as native ORF raw files. So Aperture had no problem importing them. Given the quantity of files....a lot less problems that I would have guessed. My Aperture library is approximate 50GB. Not too bad given it reflects 56,002 photos. I also created an Aperture Vault as library backup. And of course Time Machine backups up everything. For the time being I will have fun using both LR and Aperture. Either can open/use the commonly referenced originals. And if Apple does deliver a big upgrade to Aperture this year, I just might drop LR completely. Why drop LR for Aperture? Subjective UI differences..I like Aperture design better. Also the easy of integrating Aperture library contents with other Apple apps like iMovie, Maps, Keynote..etc. But folks will say....but Aperture does not have the editing tools that are available in LR. Correct. But if I am seriously editing a photo, LR does not have the tools I likely want either! I will use LR or Aperture for basic edits. But if I need serious work done, I will have the file in some combination of the Nik Collection, Perfect Photo Suite 8, Pixelmater (rarely), or Helicon (if I need to focus stack). So let's see what the rest of 2014 brings. Very likely we will see killer new versions of both LR and Aperture. It is always good to have options.