Ive used paperport pro for a while. It came with a xerox scanner that I bought. I am constantly scanning and faxing so I bought a nice scanner that automatically fed paper (up to 50 sheets).
Ive upgraded twice. I like it much better, even though it is nothing more than an interface for folders on your hard drive. It shows thumbnails and many other features which makes it nice. Its about 100 bucks to upgrade it, but its free with the scanner. You can buy it online from Nuance.
Now, I HAVE the neatreceipts scanner. Im not anywhere as thrilled with their software. I use paperport most of the time. It is nice though when you import the receipt to quickbooks and it automatically enters it in for you. You can scan the receipt. Once it does one receipt with the business name and what you file it under (fuel, parts, etc.), each time you scan another, it will automatically file it for you. You can import it into quickbooks and it will put it on the correct tax line there too. It has its good points.