The DSC-W830 has a CCD sensor type which is better than the MOS sensor type found on most digital cameras that were launched around the same time as it. 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 cameras of this age and type.
The worst sensor type amongst comparable types of camera is MOS.
We think you might also be interested in some of the other cameras that have a CCD sensor currently available including the Nikon Coolpix S3700 (£98.75) which is cheaper.