My regional rate is $.5, but we play a flat rate which means we pay more when our consumption is less, and less when our consumption is more - so I really couldn't develop true *HARD* numbers in the short period of time when I tested the devices. At those kind of numbers, when using relatively low-power devices, the savings are gradual - you'll see the benefits over a year, not a month.

But it would be interesting to run a long term test in an environment where the cost savings could be substantial - and an online calculator on the manufacturer's site would be a good idea. I'll suggest it to my contact there.

Also, covering 4 devices and explaining the features as a high-level over-view was the goal of this article. I had a lot of ground to cover and the format of Tech Republic calls for relatively brief articles. Let me just say, there are extensive logs written to your PC and fairly robust metrics gathered by the device. You can download the documentation for all 4 products at the manufacturer's website in PDF format prior to purchasing. If you're interested in understanding the logging and report generating capabilities of these devices, I'd recommend downloading the docs.