After reading the reviews, I had some concerns. But they were the only site that were offering any decent money for the particular textbook that I had. So even if they scammed me, I didn't have any other selling options. So in that scenario it seemed worth the gamble. It's been about 3 weeks, and they put money into my PayPal account. Was it the full quoted amount? I don't remember. But it's something. So I can testify for sure that they are not a total scam.