Got one of these to replace my ever-faulty Canon Lide 90. While it may look absolutely identical to the Lide 90 (albeit costing about £10 more) this is just a better machine. Scan quality is excellent with natural colours and pretty impressive reolution (max 4800x4800dpi compared to the Lide90's 2400x4800dpi).
It's fairly quiet, powers off the USB port, has the nice 'z-lid' which concertina's up to allow thick books etc. to be scanned.
Now, speaking as a Mac user, the software is not great with it but it does OK for the most part. In any case, I scan directly into Photoshop which brings me to the next point. This is a TWAIN scanner (stands for Technology Without An Interesting Name - it does, really!) and these have, in the past, worked fine with Photoshop. However, the new version - Photoshop CS4 has dropped native support for TWAIN scanners. Now, at least on a Mac, there isn't really any other option. Not to worry though, Adobe offer the TWAIN plugin on the Photoshop install disc, you just have to go add it seperately. After that, it works beautifully.
Anyway, great scanner for very little money. Recommended!