This program is my default for all PDF files. The editing & markup abilities are endless allowing me too edit most text using their text editor depending on the PDF origin or erase areas on non-editable text and replace with new with a matching font type. The stamping tool minimizes my work when reviewing, approving and issuing for fabrication or construction. You can create your own custom stamps to match your needs and save them for future use. I often use the compare feature when reviewing revised drawings to see the differences or overlay the drawings. Sometimes when i'M reviewing multiple page documents I will use the split page feature so I can reference different pages at the same time on my screen in separate windows. One example is to reference a detail while reading the description on a separate page without need to flip back and forth to another page. When I'm estimating I can open a CAD.dwg in BlueBeam automatically converting it to a PDF. This PDF retains it vector properties allowing me to search the drawings using a visual recognition to quantify objects recording them in a spreadsheet with many options to categorize and export features. If the drawing is to scale you can calibrate the measuring tools to the sketch or drawing, adjust the precision and measure length, area, volume, diameter, angles, etc. all being recorded in the spreadsheet for future use. If you select a row in the spreadsheet it will highlight in the document referencing the selection. I often combine separate PDF documents into one file or separate a file into multiples. I can replace, reorder or remove pages from a PDF document. Bluebeam also has a tool chest with many helpful tools(graphics, symbols and shapes) available from the website for download. Using this with my Autodesk software allows me to export from Revit to a 3D PDF viewable on any PC with a PDF reader. I have sent files to clients on many occasions and they are blown away with the file in a 3D view using only a viewer (adobe reader or Bluebeam). The file has 3D tools embedded so the user can control visability, manipulate, section and even measure in the model. This is the most useful program on my workstation and there is much more to this software than I use it for and I believe this is also well worth the price. I'm using "Bluebeam Revu x64 eXtreme"