I got Paperless in a bundle.  I didn't really see the need because I  
already use another app scanning.  How Paperless does make the receipt  
searchable instead of just being an image file.  But then again, I've  
pretty much have all  the info I need already in MoneyWell, so it's  
just duplication of effort.  Beside, with the image attached to the  
MoneyWell transaction, I already can see it an retrieve in the Finder.
My opinion:
MoneyWell is an account app that can contain a copy of the receipt.
Paperless is a document scanning app that has a hint of accounting.
For warranties, original receipts are usually required.  But when it  
actually comes time for warranty work, sometimes they just ask you to  
send them a copy anyway.  To be safe, keep originals only for items  
you really might want for warranties.  Everything else I toss out.
Terry Norton
I started off with nothing...I still have most of it left