Needs Yosemite update
Since Yosemite was released, this app has not been working properly. It slows down and crashes frequently when annotating. The developer seems to be MIA (no responses to problems reported months ago on the PDF Reader X support page). I purchased the premium edition for this through the in-app purchase options, and now I regret this purchase. Not recommended.
PDF Guru: Read/Annotate PDF, v1.20