Lightroom's external drive access (without copying the photos) is a game-changer in terms of photo editing on the iPad. It opens up mobile photo editing on the iPad in an accessible and ‘real-world’ way. When you're working with raw files, some 35MBs per photo or higher, the cloud doesn't cut it. I think this alone will make the cost the Adobe Creative Cloud subscription worth it! Check out: 'Adobe Previewing the Direct Photo Import From External Storage Coming to Lightroom for iPad' on MacStories here.