Modify PDF Documents Online via Python API

What do you like best?
We use it to generate fillable forms for customers - it works very well whether inserting date or image.
What do you dislike?
The document management part is a bit confusing. It can be difficult to work with templates vs documents, and with shared templates or documents.
What problems are you solving with the product? What benefits have you realized?
PDFFiller has made generation of forms - both using their web app and API, extremely productive for our operations team.

Some functions are not readily apparent but overall it is a great tool. I had difficulty when it auto-filled a date field that I wanted to leave blank. I struggled to clear it because the dropdown appeared every time I tried, and if I deleted the current date got restored by the dropdown. Then after I finally blanked the field it jumped to another and did the same thing. Once I got that cleared it would not let me go to the next page, insisting I populate another field intentionally left blank. I used the slider to jump forward and then approach the page I wanted from the other direction.

Cost effective and top class customer support, integrating pdfFiller has been a breeze, my team use it everyday to send out dozens of branded quote documents and it's never failed us. The main driver for us in this decision was the ability to use our own branded PDFs. The second was the ability of pdfFiller's system to integrate with Salesforce via Zapier. I genuinely can't think of anything I don't like. It does exactly what it needs to do.