I used PDF-XChange Editor for collaborating and creating annotations on drawings, and it was the best in the market. The main reason I used it was because of the smoothness and lightweight nature coupled with a powerful annotation bundle. I appreciate its ability to work well on budget computers. I also like the annotation bundle and the ability to add JavaScript tools. It was perfect for editing PDF files, allowing for perfect content editing without needing to use Doc or xlsx files. The initial setup was really easy, and if you've worked with other PDF tools before, you can easily adapt to this one. Review collected by and hosted on G2.com.

I think the UI could be improved. It's somehow old-fashioned. I think a modern design would be better. If there was a feature to add pattern fill to objects, it would be very useful. For example, a diagonal hatch for a rectangle instead of a solid fill. Review collected by and hosted on G2.com.