We are using pdfexchange for 6 years now. We have looked ad bluebeam but found no features we need wichbare not available in pdf-exchange and would warrant the extra cost. My engineers yous pdf-exchange to make all there sketch designs and reports over the architect drawing PDFs. And our cad use it the markup drawings for the engineers and for themselves. The only think was making dynamic stamps is not so easy in exchange so those were made with BB and are use in pdf-exchange. At the moment making dynamic stamps is also possible in pdf-exchange. So no regrets for buying pdf-exchange here.