What a pure joy to use!

They really nailed it. Make the functions most users what to perform stupid simple to use.
The app deals with scanning in batches and with stuck pages brilliantly.
I recently had a fairly large archive job (for me...about 200 pages) after not using the Epson scanner with ADF in over 5 years. Still burned in my mind was the difficulty of using the bundled apps or worse yet multiple apps.
This app just keeps a stack of scanned pages. Just keep scanning until you want to make a file. Then clear the buffer and start again.
Literally a 3 button action. Scan, Save, Clear and then repeat.

VincentA-123 about PDFScanner - Scanning and OCR