Apple’s new favorite child is not without its flaws. The virtual keyboard is a pain for composing anything beyond short notes. The nonexistent file system makes finding important documents difficult and sharing across applications nearly impossible. Finally, managing a large number of readings in PDF format becomes a major time-suck. Syncing PDFs via iTunes was found to be "needlessly complicated," emailing marked-up versions back to oneself was "prohibitively time-consuming," and even the cloud-based storage, Dropbox, "failed to work seamlessly with PDF reading/annotating applications."