Have just come back from Karon and unless you enjoy bars full of bar girls, being hassled in the street everytime that you walk past a tailors, shops full of tourist tat and fat rude swedish tourists I wouldn't bother.
Patong was badly damaged in the Tsunami and has been rebuilt with some quality bars and restaurants and is much more sophisticated.
We drove all around Phuket and it is very disappointing nowhere near the paradise that it is portrayed to be. Since the Tsunami all the prices have gone up and you get the feeling that everybody wants your money but doesn't want to give you anything in return. It was a great relief to be back on the mainland where everybody just wants you to be happy.