I used LR for years. Over a year ago I started playing with Aperture and like it very much. Using either LR or Aperture required plugins to do the full range of what I wanted. When I saw that Apple was officially killing Aperture I deleted my copy and stayed on LR. With Aperture dying I have yet to see another DAM beside LR that can do integrated round trips to plugins. That is a critical requirement for me. IT may not be for others.
So I am looking forward to LR 6 release on Tuesday. I hope performance has improved with the 64 bit only architecture and use of GPUs. I will still use the LR Library as my DAM. I will do most raw conversions using LR; however, when I think I can do better in DxO Optics, I will send the raw file there and get back a DNG. I will then finish the image as needed in Perfect Photo Suite.
I am really glad I was not a long term Aperture user. I would be one POed photographer right now. What a shame a third party company would not be allowed to purchase Aperture and continue the evolution.
I agree with most everything above. I plan to re-look at LightRoom again. It sounds like, from this description, that it can now import most of the metadata correctly that iPhoto has:
http://www.lightroomqueen.com/ready-move-aperture-iphoto/
except for Faces, which is (imperfectly, but better than nothing), just a tag. If LR would add faces, I would convert ASAP. (I still have everything in iPhoto databases because of its Mac-Mac portability right now.) I'm not sure if this is something that can be done with a plugin, because, you need a database of people and pointers to the photos and rectangles within each photo, as well as import workflow where the facial recognition itself can be processed.
The Places problem is also a big one. What I like about Photos is that the import workflow allows you to identify places beyond GPS (not always available or correct) and correct/add on the fly, as well as faces, and then split up into events.
This workflow works perfectly for people like me who use iPhoto professionally -- just not as a professional photographer. I am acquainted with 1000's of people through work, but, can't always keep track of who looks like what. iPhoto + Contacts integrates with contacts on the iPhone, and, it all works. And, the same works in my free time, when I go on vacation and mark which, I don't know, beautiful waterfall in Yellowstone that was among the thousands of waterfalls there. That is basically Photography 1A stuff -- "write down" where and when and how the photos were taken.
The problem with all the other tools mentioned in this and other threads is not that they don't work. e.g. I can always grab a jpg, move it to Windows, use Windows Pro Photo Tools to edit the EXIF etc data. But, I could easily spend five minutes on something that can be ten seconds in iPhoto as part of the import workflow. And, those data not necessarily accessible and visually presentable when you are giving a slideshow either. With iPhoto, the location where something was taken is instantly available when people ask a month or a year later. With iPhoto, I can show you on the map.