The Guides advise that, regardless of the price of the product, advertising terms such as "satisfaction guaranteed" or "money back guarantee" should be used only if the advertiser is willing to provide full refunds to customers when, for any reason, they return the merchandise.
The Guides further advise that an ad mentioning a satisfaction guarantee or similar offer should inform consumers of any material conditions or limitations on the offer. For example, a restriction on the offer to a specific time period, such as 30 days, is a material condition that should be disclosed.
For more information, see here: http://www.business.ftc.gov/documents/bus01-businesspersons-guide-federa...
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