PostView is similar to the Apple's Preview with a few added niceties, the purported ability (I have not tried it) to read PostScript files, and one essential feature that Preview lacks, a "Find" command. The want of a "Find" command makes Preview useless for reading long documents, so the real competition for PostView is Adobe's PDF readers. Compared to Acrobat/Adobe Reader, PostView is quicker, fills less of the screen, and generally feels more Mac-like. However, unlike Adobe Reader, PostView cannot show thumbnails and it cannot display the table of contents of or search for text through PDF files that come locked. Also, PostView can select text only in whole lines, à la 1978. Overall PostView makes reading PDF files more pleasant but is less practical than Acrobat Reader for many of them. My wife and I both prefer it enough to use it as our default reader but we find ourselves opening Adobe Reader for a lot of files. PostView might seem preißwertig even in the face of Adobe's freebees if PostView allowed the user to fill in PDF forms and then permitted something that the freebees do not, saving a form with the text still editable. However, currently PostView cannot fill in PDF forms at all, nor can it even save files under another name (although "Save As PDF..." is available from the PDF menu in the Print dialog)