The GE X500 has a CCD sensor type which is better than the MOS sensor type found on most cameras that were launched more than two years ago. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
A CCD sensor type is actually the best sensor type across all bridge camera digital cameras that have been around for a comparable time to the X500.
Across comparable types of camera the worst sensor type is MOS.