Use Cases and Deployment Scope
I use Tungsten Power PDF whenever free PDF programs reach their limits and don't offer the features I need. The main features I use are merging PDFs, extracting information from many filled-out PDF forms, creating Word, Excel, or PowerPoint templates from PDFs, and signing PDF files. In addition, its PDF commenting and editing features work significantly better and are more powerful than Adobe's, for example.
Alternatives Considered
Adobe Acrobat and Apple Preview
Other Software Used
Apple Preview, Adobe Acrobat