As a pianist I am always looking to print new piano scores and make booklets myself.
Before printing the pdf often needs to be reworked. I like to join multiple pieces together, so the page numbering has to be redone. The headers and footers need to be modified or deleted.
All of these can be easily done with the “delete all instances” function in Infix. So there is no need to do it page by page, which is a real time saver.
Infix PDF is definitely more powerful then Adobe Acrobat Pro when it comes to modifying a PDF. It is easier and more intuitive to modify the font of a text, making it bigger or smaller or put it in bold. And it also allowed me to move text where Acrobat Pro would not let me move it!
For the musically inspired amongst us: you can even copy paste a complete staff of music! I use that feature personally to add a content table to the pdf. The content table then shows the first line of each piece, just as if you would buy a real book with sheet music.
I would recommend Infix to anyone that is looking for a decent PDF editor.