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?
I have been using PDFfiler for more than 4 years. It makes my pdf documents look professional. There is no longer a need to print a doc, fill it in with pen, scan, and send. PDFfiler reduces the amount of steps I have to take to get the job done. It helps to also have everything saved on the My Docs page. I can find the same tax documents I need month after month. PDFfiler also reduces the amount of paper needed to generate a document. I probably use PDFfiler every day.
What do you dislike?
I would like to be able to turn off the assisted pop-ups. They can obstruct the box I want to enter text.
Recommendations to others considering the product:
Simple to use. Makes your docs look professional and neat. Easy to manipulate a doc that is incorrect.
What problems are you solving with the product? What benefits have you realized?
I fill out every form on PDFfiler. It's automatic to me. In addition, when I am unable to edit a Word doc or other pdf, I know I can upload it to PDFfiler and get the job done right away.