I just read the MacWorld review, and it sounds like they thought the software worked well. Another user review, also using it on two different Macs, said the sheetfed scanner was nice but the software was unusably slow. I dunno; you may want to make sure that you can return it to wherever you buy it from.
I like my little portable neat scanner, and it works well for scanning stuff to Evernote. But I'd recommend looking at others, like the ScanSnap--we use those at work, and I think the software that comes with the ScanSnap is far better than the Neat Receipts software, although I don't fully exploit all the features of the Neat software.