Get $50 Back From Chase

Chase has a new credit card, the Chase Freedom Card, and it looks like a decent card with a 12 month 0% introductory interest rate. But they are offering $50 back (actually, it is $50 in some kind of credits that can be turned into a $50 check...). Looks interesting. There does not seem to be any limit to the purchase...so, you could pay $2.50 for a coffee at Starbucks, get $50 back from Chase and never use the card again...meaning that coffee cost you -$48.50. That is a deal!