PDF was produced from the PS versions and the conversion process may have introduced modifications. The page numbers and chapter titles may be missing in some PDF versions. This is a bug of gv, gs and lpr do work correctly. The font sizes and margins of these files are smaller than in the documentation shipped with the PowerPack to allow for fewer printed pages. Make sure your printer is properly setup to avoid missing some of the contents.
Files are in compressed formats to allow for quicker downloads.
The final uncompressed size is also provided to notify you of the storage space required on a hard drive. Provides higher compression but doesn't work with as many decompression utilities. PDF was produced from the PS versions and the conversion process may have introduced modifications. The page numbers and chapter titles may be missing in some PDF versions. This is a bug of gv, gs and lpr do work correctly.