I use the PDF Factory too, to make PDFs out of Word docs, and such, but it leaves that "PDF Factory" down on the bottom of the document, which I find a bit tacky, so with Nitro, I can delete that, can edit spelling in most any PDF (although there are some that are un-editable) its just a nice little program all around. I can also combine files to create one PDF, so any Word or Excel docs I want to add all combine into one PDF document.
Tonight I downloaded the newest upgrade and found I was able to reduce the size of my file from 19mb to about 4, which was great because that meant I could finally email it!
I had to edit some math in a report this afternoon, and it saved me from having to go into the program, change my narrative and completely save the whole thing again, all I did was open it in Nitro and click 'edit" and re-calculate my figures. Made it a lot easier since that was the only portion of the estimate that needed changing.
(Gee, someday I'll learn to add correctly and might not need it, but until then....) LOL