I got the Wireless Plus because I can backup my Mac with Time Machine and access the files with my iPhone using this app. It works up until there are many many backups, then I need to reformat the drive and backup fresh, or else the app wont see the files any more.
One other issue I found is if I download something, like a film, from my TM backup to the app, then delete it, the app doesnt actually delete it. The app still takes up the same space on the phone as if the film was not deleted. Similar to my TM backup I need to delete and redownload this app every once in a while as a result.
Leodavinci0 about My Passport Wireless