So far my favorite thing about PDF Revu is how quick and easy it is to zoom in to write a small note, and then zoom back out. My next favorite thing is how text is vector based, and how when blend mode is off, the thickness of the ink is the same at all levels of zoom. My least favorite thing is trying to move or resize annotations. Selections must be grouped first, otherwise only part of the selection will be affected. My next least favorite thing is trying to switch between different pens. So far I've been using my toolbox, which takes up way too much screen real estate. It took me a while for me to figure out how to add a custom pen, yet the icon for my pen mocks me by showing a picture of a highlighter....for my pen.