I have owned a couple of Visioneer scanners, one being the Visioneer OneTouch 5800 USB Scanner. This scanner is a very simple flatbed scanner, making it fairly easy to scan documents and photographs. If you are looking for a top of the line high quality scanner, look elsewhere. If you are just looking to use a scanner for simple document and photo scanning, the OneTouch 5800 is not a bad deal. This particular model is an older model, so I wouldn't recommend spending a lot of money on it. I personally bought this model in used but excellent condition, and only paid $15 for it on eBay. Don't spend more than $25.
I've seen other people blast this scanner for design flaws, installation problems, and poor software. I can't say I agree with those reviews. My experience with this particular model has been just fine. Keep in mind, each person has a different set up, and with computers you will always have the possibility of hardware compatibility issues. Do some research first, then purchase. Overall, this scanner is a decent product if you don't spend a lot of money for it.