I bought the Fujitsu ScanSnap S1500 Instant PDF Sheet-Fed Scanner for PC back in February of 2010. Fast forward, its now 2017 for this post and we are still going strong! No issues, has worked flawlessly, scans every sheet, no joke! Love it. I do a mass amount of scanning for my business and this has never failed to deliver.
It scans a very large stack of paper and it also scans receipts (as long as you have them all lined up correctly.
This exact model I purchased has been upgraded but Amazon still sells this model, but boy is it pricey! Here is the link.
Here is the newer model with wi-fi! Fujitsu iX500 ScanSnap Document Scanner (PA03656-B305)