[dave256]

I don't work for OmniGroup, but since nobody else has replied, I'll give it a shot. As long as you draw starting at the top left of the screen, they appear to be cropped. If you leave white space to the left and top, that appears in the image. I too use LaTeX and tried exporting an OmniGraffle for iPad document to PDF and including it in a LaTeX document. It appears to start at the top left of the page, but does not include much white space beyond the bottom right of the last object.

Yes, the PDF appears to be in vector format. I brought the PDF into Preview on my Mac and scaling it to 1600% and 10% looks good - not as if it were a scaled bitmap.

Before spending the $50, I'd email OmniGroup's support or sales team and ask your questions to be certain.