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It's great for transferring files wirelessly, as well as annotating PDF's and reading PDF's (better than iBooks).

I use all of these functions daily, it's definitely worth it!
 
Use it regularly to maintain document libraries on iPhone, iPad. Mainly PDFs. I don't usually annotate them. I use other software for writing. Works great for me.
 
Edit: Talking about a completely different app, please disregard/delete this post.
 
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It's absolutely worth it. I use it on the iPhone and iPad. To me it's the Swiss army knife of iOS file management. Also great to connect to all kinds of cloud storage. Plus an awesome PDF reader with great annotation features.
 
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