The most useful feature I love about this product it's how easy you can use it for creating your own pdf document as well as reading others pdf documents. And also when using other products like Google Docs or Microsoft office its very helpful in downloading the attachments that are needed. Sometimes there might be some difficulties while opening certain pdf file types but not a big deal since it works with almost all kind of file formats so nothing bad at all i think. Great program if you're looking for an online reader then this one is best among them. Creating our own pdf reports which we will give to client, clients will have no problems using those because they are really user friendly. I like how it can be used with multiple file types at once (MS Word docs). It's easy enough for my team members who are not IT people but do have some coding experience as well! The interface could use more customization options so we don't need an expert coder in order just get something working right away - which would make training easier too when new staff join our organization or if existing employees leave/change positions etc.,etc..