What do you like best?
PDFiller is ultra-convenient and super-easy to use. It's in the cloud, so it's easy to access. And it has a vast array of features. Storage is a cinch, whether on your hard drive or in the cloud.
What do you dislike?
I can't think of much that I don't like about the program. There might be a more direct or seamless way to save documents to Google Drive, in terms of getting them straight into a particular folder instead of just onto the Drive, but that's a minor issue.
Recommendations to others considering the product:
Try it. You'll like it.
What problems are you solving with the product? What benefits have you realized?
PDFiller is a lifesaver when I'm editing contracts and related forms. The clarity of the input and the ability to maneuver the text around the document is a huge plus. Line-outs and erasures are a breeze, making for "cleaner," more legible documents.

What do you like best? Ease of use and broadness of applicability. What do you dislike? Its ease of use and broad applicability trumps any minor issues. I am not aware of any significant issues encountered. I evidently need to keep typing, because I'm not able to finish this task otherwise. What problems are you solving with the product? What benefits have you realized? Being able to fill in PDF's without using more expensive solutions. Also used to authenticate signatures in various ventures. Comes in extremely handy actually.