Yesterday Apple announced a 30 day money back guarantee, basically a 30 day free trial of their entry level Mac Mini, but pulled the offer within hours of announcing it.
There has not been an official statement from Apple, but the speculation is that the offer was too successful and they had too many Mini’s going out the door. The drawback of the offer would have been that any that were returned during the 30 days would have to have been refurbished and could not have been sold as new.