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 like that I can fill in forms for all of my taxes, and they are saved permanently for future reference.
What do you dislike?
It is difficult to find a form that I need. I have to do a general google search, then click on the link, and fill in the form, then log into my pdf filler account. Wish it were easier to find specific forms.
Recommendations to others considering the product:
It's an excellent product for filling in forms, and creating documents.
What problems are you solving with the product? What benefits have you realized?
taxes. It has been helpful for me for the quarter and yearly tax forms I need to fill out (941, 940, W2's, W3's and 1099's).