Summary: I have both the Mac and Win version of this scanner. As of 11-05-09 there is still no driver for Mac OS 10.6. This is critical since major functionality is compromised. Fujitsu's advice: "Reinstall OS 10.5." Incredible. As of this same date there is still no driver for Win7 either. Is this company brain dead?? If you are using Mac OS 10.6 (Snow Leopard) do not buy this scanner. Same for Win 7.
Summary: I have spent hours on the telephone with Fujitsu support trying to get the scanner to initialize properly and consistently. They tell me that certain HP chip sets have compatibility issues that cause the scanner to randomly not work and that there is nothing they can do. The bottom line is that I cannot rely on the scanner to work when I need it. On the days it works, I love it. The rest of the time not so much.
Summary: The is a great scanner for converting documents to pdf. However, only has color and b&w options, no grayscale. If you have grayscale documents to scan, this is a major limitation. Pros: Good design, small, scans duplex, comes with Acrobat 8.0 Standard (must register), scan quality good with slow speeds, works with VISTA. Cons: No grayscale mode as above.
Summary: For the price of the product, and the advertised speeds and functions, you'd think all of your printed material could be fed into this scanner. You'd be wrong. Snapshots will jam in this device. You are locked into Fujitsu's software for scanning. And, you do not get TWAIN drivers for the device, so you cannot acquire images from this scanner when inside a program like Paint Shop Pro.
Summary: A fast document scanner like this one can be a huge help in organizing your life. Six months ago, the S510 was about the only game in town for a reasonable price. Now, there may be better options, especially for rather heavy-duty users like me. The pluses have been well-written about, so I'll give only the minuses: 1) No Grey Scale! B/W is fine for pure text and some graphics, but is horrible with photos.