Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works for just a little while

I bought two canoscans 3000f The troubleshooting manual was worthless -- and you'll need it not long after purchasing the canon 3000f. WHEN you find support downloads on the Canon site, you can install and uninstall all day and the scanner still won't work.In fairness, it's a cheap scanner and Canon treats you as poorly as any of the other makers I've tried in the past, HP, Epson, and Umax.