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I set a stack of 17 two-sided documents into the sheet feeder, pressed the blue illuminated "Scan" button and the ScanSnap 1500M whipped through them in 50 seconds. I was honestly surprised that my computer (a MacBook Pro with a 2.2 Ghz processor) was capable of accepting data at such a fast pace. I was used to scanning documents on my HP C4280 scanner-printer-copier, which is mind-numbingly slow and has a buggy driver that crashes my computer, forcing a reboot about 25% of the time I use it.
A few seconds after all the pages were scanned, the Evernote application made a pinging tone, indicating that the document had been scanned and saved. I checked to make sure that both sides of each page had been scanned correctly -- yes they had, and the software discarded the sides that were blank). Later, I tested Evernote's character recognition and found it to be flawless. That means my documents can be found by entering keywords into Evernote's search field.
Since I got it, I've been processing about 100 pages of documents per day.