For me the most useful feature is the Digital Signature. I can just sign digitally and send it to anyone I want to without printing a copy. Also, I use the PDF pages rearrangements very often. One more positive is I can easily add TEXT to a PDF which is mostly uneditable.

It is very easy to use plus it is free if you need only for basic usage. You can go for business plan for corporate. I use it frequenly whenver I want to edit PDFs.

It is simple and it works! I just does the job!