A well calibrated TV looks stunning. It really helps you get the most for the money you spent on the TV. But the cost of a professional calibration, using sophisticated tools, isn't cheap. I only recommend such an extravagance when the home theater you've purchased is more than $10,000.
Others have different opinions and some change their opinions too. Andrew Robinson of Home Theater Review has reversed his position on getting a professional calibration. Let me share it with you, Rethinking The Importance Of Video Calibration.
Robinson makes some good points. And, hey, if you can afford it then go for it.