Ive used this app for at least two years, and find it to be mostly reliable and easy to use. Highlighting is straight forward. Select text and highlight, using the pop-up menu or tapping the highlight color of your choice on the tool bar, at the bottom-center of the screen.
One feature Id like to see added is the ability to create sub-folders. Im really starting to need them.
Sandalwood7 about RePaper Web PDF Highlighter, v2.5