If I could only have one app on my iPhone and iPad this would be it! It is way more than just a PDF viewer/annotator. It is also
the best file manager out there (that is what I mainly use it for). It has great organization capabilities, can be connected to for file transfer/syncing in many ways, and has great support for a lot of file types. I use it a lot to
listen to audio and lectures. I can have the PDF of the lecture is about open with the lecture playing. I love the skip forward and back 30 seconds option too. It also remembers where I left off on the lecture and which ones I have
already listened to/read. The only thing I wish it had was support for ePub. I believe it is by far the most essential app for iOS devices.
—xiblal., Review on Apple Store
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