Works Brilliantly

Works without a hitch in South Korea both with and without a data connection.
Works with Canon 450D and RAW.
The Mac app is light weight and easy to use. It fits well into my Aperture workflow. Just run the app before importing everything into Aperture, iPhoto, whatever.
Side note: Il tried to use the app in airplane mode an it didnt work. In iOS 6, if you turn off cellular, the GPS component will work just fine. I did this to conserve battery.

96kiloblips about gps4cam - Geotag Your Photos, v6.2