should point out the 300 may not be as fast as the others commented on?
I've no personal experience but there's a comparative review of docu-scanners including the S300 in c't (german language) magazine last month - I like their reviews - they're more like user reports
In terms of speed it gets a "satisfactory", less than most of the others, but then they mostly double the cost.
"Good" for OCR quality (included software is Abbyy FineReader 7.x)
"Poor" for graphics and for "Noise measurements"
generally "delivers good results"
from what they say, probably wouldnt be suited to heavy-duty office work but you're probably okay that way