Summary: I purchased the BulletScan S300 from Amazon in December of 2010 for 262.99. It fit all my requirements, and at first I was thrilled. Then, after nearly 2 years the ADF Roller needed replacing. So I contacted ivina.com in late September 2012. They said they would not sell me a roller.
Summary: Paperfeed has trouble with notebook paper, often eating it. Also big downside is that detachable portable unit is NOT USB powered; must be plugged in. Very bad feature for a supposedly portable unit.