Better then build in os x viewer, if only there was a night reading theme Needs one more thing that build in viewer is missing! The ability to change the background color of the paper to any RGB color one want's
Ok it's the best PDF reader for Mac and very ergonomic with its multiple types of annotations.... but the annotations are not displayable in other pdf viewer software (adobe, pdf-xchange viewer) including the one that is freely included with a Mac (Preview). So collaboration wise, not interesting.
There are no 2 star reviews.