I'd say that for the average user who just does office work, check email, blah blah blah, this monitor is useful and would be good to help reduce bills (good for offices and schools that need to save more money. But to those who constantly watch movies, edit videos and photos, and do design work, this monitor isn't really the best choice. I mean, I could be wrong, but this just doesn't seem like it can give you the brightness and contrast you need for doing this type of work.
I normally use a Westinghouse, (yes Westinghouse) 22" WS on my internet computer. This panel offers three instant settings for brightness, "picture", "text, and "economy". I know that this is considered an "off brand" screen, but these instant adjustments are really, really helpful. I usually run it in the "text"(middle setting). I can use it in this mode for hours in this mode without eyestrain. It would seem that dimming the backlight produces these different modes. I'm thinking that reducing the brightness then also reduces current draw. (If I cared enough, I would buy a "Kill-oWatt" meter to check. Alas, I don't).
Excessive contrast, IMO is way overrated. High numbers impress the tourists, but for photo editing and subsequent printing, it's rather pointless, since printing paper doesn't have anywhere near the gamut of even a lower contrast monitor.
That said, it would seem I'm endorsing the Dell approach, however I'm not. Most "green" products are over priced and over hyped, this panel is no exception. Especially in light of what you must pay for the name. Even in this day and utility costs, the 100 bucks or so more that you pay for this panel, compared to others in this size range still buys a lot of electricity . For all intents and purposes, all Dell is doing is turning down the brightness for you, so you don't have to.
Obviously, the energy saving approach might be more beneficial in a corporate environment. That said, in corporate environments, many employees would piss any energy savings away with some nonsensical screen saver anyway.