The Polaroid iE090 has a CCD sensor type which is better than the MOS sensor type found on most digital cameras that have been on the market for 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.
This camera's sensor type (CCD) is in fact the best sensor type amongst all similar spec cameras that came out in the last year.
The worst sensor type amongst comparable types of camera is CMOS III.