I personally, prefer not to use it over an entire image because it degrades the image by blurring. Both work just fine. I'd like to keep the newer one clean. Dust Off is available at Longs. Omnipage works best scanning 12 point times roman text.
Smaller type is less accurate.
Helvetica causes m's to turn into r n, S's or 5's switch back and forth to each other, and so on. OmniPage color highlights text it can't make out which makes editing more enjoyable. There's lots of settings and saving features, so feel free to ask me when you have a question.