Impossibly buggy. Dont buy at all.
Update: I hate this app with all my life now. Buggs increased and now it constantly crashes. I. Want. My. Money. Back. Dont buy this thing, please.
I absolutely love the app and the features, the concept is great and it would make your life complete... If only it worked correctly. Its very slow, even slower for searching keywords inside the document and sometimes (often) while youre writing it glitches and you lose all the comments youve made in however pages it decides it didnt save. Oh and this "saving" its supposed to be done automatically, so you dont have any "save button" option.
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PDFpen 5 – PDF Editor, v2.5.1