Aperture lack of DNG support unfortunate
It's difficult to understand why Aperture does not offer support for Adobe DNG files.
DNG/RAW files are being used by some camera manufacturers that I work with, and they contain a wealth of metadata as well as the broadest range of image data, including "altitude", which is now very useful in my professional work.
This lack of support has forced me to go back to Lightroom, and to reconsider that application as my primary media catalogue and editing application.