As a PDF viewer, it works very well, and it should deserve all the stars. However, it is not possible to write that it supports postscript when it does not. Using file selector in open, it would not see the postscript file. Starting it from the xterm, it complained about mime-types. If it is necessary to or modify mime-types, it should be said somewhere. "It currently supports pdf, postscript, djvu, tiff and dvi." says the description above. But not on my tablet!