anyone go from a 996tt to a 997tt?

wanted to know if the 997tt is worth the $ difference if I sell my 996tt to buy a 997tt,  anyone driven a 996tt tiptronic and a 997tt tip?  whats the difference's?  worth the $?  I want to know before I put some money into my 996tt.. exhaust, air box, ecu reflash..  maybe its just better going to a 997tt?
 
thanks in advance.