I am not familiar with SLMPDF, but here is my experience. I scanned a 3 page document with blank backs in 2 sided mode. The scanner scanned them and the PDF document appeared on my Mac in 6 seconds with the blank pages removed. That six seconds included the scanning of each page, transmission of the pages to my Mac via WiFi, the removal of the blank pages and the saving of the file to the Mac file system on the SSD.
I would not call this a "production scanner" for an office full of people, but for home use it is pretty nice so far.