The UI is outstanding and very effortless. Very impressed. My only issue was with advanced features. Would have liked to know ahead of time that they were additional fee. Everything looks included and don't like being told something cost money after the fact. Second, when telling me I had to upgrade to get additional feature, it should show the difference between what I am paying verses the new amount. I was on personal plan ($6) but to get the features I needed it was ($10). It said it was $10 for advanced plan but I didn't know if that meant $10 MORE than I was already paying. I had to open site in incognito mode, look at plans to figure it out... not fun. Lastly, I was trying to send 2 separate PDFs as one doc. It took me a while to figure out where Merge was. I didn't understand why all the options under Actions were greyed out. That was very frustrating and should be improved.

It's the best experience on pdf editors, the only thing is that i passed 10 minutes just to find how to change the color of the text, i suggest to modify the icon of the text color for better user experience and as a back-end developer I thank you for the work you are doing, work for your project, believe on it and you will have more success. I hope you share my comment with all your team, this will motivate them to do more effort for pdfFiller. have a nice day, stay positive and good luck.