If I had to purchase one now I would have a close look at bidgley.com to see what equipment works with them.
The main difference is that the ted will tell you how much you used, but the bidgley will also tell you what is on and how long (you need to train it though).
I also helped a neighbour out with their huge Feb '15 bill with a current clamp on a multimeter and just watching the current draw on the panel eliminating one thing at a time. That one was a no brainer though, they installed a hot tub end of Jan and couldn't figure out that Feb was $500 higher
