Good Examples of Guarantee?

[jkendrick]

Can someone point me to what they consider Web sites that have incorporated the "money back guarantee" in the site particularly well? I'm struggling a bit with how to do and not throw off the aesthetics of the site. Thanks!

[Rafi]

How about try Tim's site: http://www.brainquicken.com/

[jackson]

The 200% money back guarantee is supposed to boost sales, I'm going to try it, has anyone found this as a helpful feature?