Good but no energy saving :) Rated 5 out of 5 stars

A very usefui addon. However, as already mentioned, the backlight of a LCD is constantly active independently of the colors it displays. That's also the reason why black on an LCD is not so nicely saturated as on a CRT monitor as in an LCD monitor a little bit of the backlight still shines through the liquid crystals. This is nicely illustrated in the LCD simulator:

This review is for a previous version of the add-on (1.9.2).