I liked its easy interface to Merge or split PDF files.

I bought the professional version (enhanced version) and it's good as password remover, editor and other extraction tools.

The first thing that is appreciated when starting PDFSam Basic (desktop application) is that it presents options to manipulate PDF documents where each option is a module within what we could call “dashboard”. With this application you can only split (in number of pages or size in Mb or Kb), extract pages, combine, rotate and mix PDF documents. It called my attention the option to divide a PDF document into several documents taking into account the weight in MB or KB indicated by the user. PDFSam Basic is offered as a free tool.