Until a couple of hours ago, I’d never heard of PDFClerk Pro. But some website or other (dealmac?) alerted me to a bargain price for it on MacUpdate. I downloaded it, tried it out, and sprang for the $25 price after about 20 minutes’ worth of fiddling.
Why? After all, I’m a Mac fanboi. And one of the many benefits of working on a Mac is that it comes with Preview, which allows you to do 95% of what you might want to do with PDFs: reorder pages, combine pages from multiple files, etc. I use Preview’s PDF-editing features 10-20 times a week, if not more. So why do I need PDF Clerk Pro?