The DotSoft program created the cleanest drawing BY FAR!! I have tried a number of conversion programs, including those from AutoDWG.com and Able2Extract. I am very impressed with DotSoft's PDF2DWG. I compared each of the programs using the same PDF file, which was rather complex and created by a relatively unknown illustration program.
Comparing each of the converted drawings, the curved edges of circles and other objects were very smooth with the DotSoft PDF2DWG, not jagged and disproportional like the others. It produces the proper line weights and original colors of the PDF, which were mandatory requirements for my project. We have many estimators and anticipate using DotSoft PDF2DWG on all of our conversion applications. It is very reasonably price for the quality it produces. I am not affiliated with DotSoft, but I am a very satisfied customer. http://www.dotsoft.com/pdf2dwg.htm