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? I like that I can pretty quickly add fillable fields and combine documents. I create printable packs for travel and RV life and this program has been so great for finishing touches on products. What do you dislike? When I add other documents to an existing one (combining) it renames the document and also makes a new version. This means I sometimes have to search through all the "documents" and even open them up to find what I am looking for. It can be pretty annoying when working on a large document with 20+ pages. What problems are you solving with the product? What benefits have you realized? I am solving the problem of needing a PDF editor. I initially needed it for signatures and filling out PDF forms for work. Then I started to use it for personal use in adding fillable fields to products I create, and bundling multiple pages together into PDF format.