I currently have the 12-24 DX. All the reviews I've read on the 14-24 have been great. People have told me that since the 14-24 was designed for FX, it would be a waste on the D300. Just stick with the 12-24. I would sell the 12-24 to get the 14-24. I don't ever see myself upgrading to FX since I'm an amateur and can't see myself paying $5k for a camera. Anyone use it on the D-300? Do you love it?