What do you like best?
As a Realtor, my whole business is based on electronic documentation. PDF filler is kind of named poorly, because it really is a PDF editor. It allows you to easily change almost anything on a pdf document...across both desktop and mobile platforms. It simply works as you'd expect it to...every time. I use it practically every day.
What do you dislike?
I wish there were better tools for generating lines (how about a toggle into and out of orthagonal for a line?) It should allow deeper zooming with a thumbnail view showing where you are in the overall document. I like my pdfs to look perfect and sometimes these limit me in that goal.
What problems are you solving with the product? What benefits have you realized?
A Realtor literally lives or dies on his/her electronic documentation. This tool lets me master the changes that inevitably occur with documents. I use it every day.

What do you like best?
What I like best about PDFfiller is that it allows me to edit and save protected .pdf files.
What do you dislike?
I dislike the search function for documents and the fact that it takes a little while for the program to open and save a document.
Recommendations to others considering the product:
If you work in the legal field purchase this software.
What problems are you solving with the product? What benefits have you realized?
The biggest problem that PDFfiller has done for me is that it allows me to edit protected pdf files. One of the greatest benefits is that .pdf saves all of my work for me.