This is for PDFpen 6.3.2. Based on my experience, I would not upgrade. I did buy it as part of a StackSocial deal, so I am philosophically resigned to the issues. Maybe it is a bug.
I wanted to edit text on a PDF. I selected the text, then went to the Correct Text button. It actually duplicated the selection, which I then could edit easily. But how to get rid of the original text. The Help section was not helpful. So I found the workaround. I was able to select the text, then go to Format Text in the Menu Bar, and select Redact Text Erase.
But I was only able to do it once. To do another piece of text I had to save the document, reopen, then repeat the process. Is this a bug or a deficiency?
Plus, the interface is somewhere between Windows XP and Mac OS9. Seriously.