LG CF181D Image Noise
General image noise has not been an issue. However, strange flickering has been ocurring, most notably while watching several of the Olympics segments. Further investigation...
LG CF181D Audible Noise
The LG is fairly typical of LCoS projectors. Noise levels are acceptable, but a good deal noisier than the quietest projectors (such as the Panasonic PT-AE4000, and the Mitsubishi LCD based projectors), but still quieter than any of the DLP projectors out there, and perhaps, a touch quieter than some other LCoS projctors At full lamp power, some of those folks especially audio noise adverse may not be happy with the audible noise, but it should not be an issue for the vast majority.
LG claims 23 db in low power (eco) mode. I put full power noise (estimated) at 27 to 29 db.
Bottom line on noise - few will have any issue with the LG, and for those really, really noise adverse, well, the LG's 23 db in eco mode, would be considered very quiet, and the LG in eco mode is still brighter than all but a very few projectors running at full power. Not to worry!