CourseSmart.com is not a scam. I just used the website to rent an electronic version of Applying Cultural Anthropology: An Introductory Reader, and it works flawlessly. I can access the book from any computer with internet access. I was not overcharged on my credit card for the purchase. I saved about $30 (about 50%) renting the book instead of buying it.
However, from sources I've read, the technical support is not excellent. I'm using Windows XP and Google Chrome to access the book and it works perfectly. I'm not sure what operating system the original report writer is using, though the website says windows xp and vista are both compatible and Mac OS 10.3.9 or later is compatible.
As for refunds, the company offers a 4 day period after buying the online version of a book for a refund (though I have no personal experience with this.)