I'm a big fan of the TED 5000, got it quite early on and wrote the "it's electric" application for displaying its data nicely on a web page. TED 5000 works well, but you may need to be persistent in order to get it working for you. Installation is not hard (I found it hard to get the CTs to close properly over the giant wires inside my electric box, but nothing terrible), but you are quite likely not to be done when you install. The problem is that the MTUs in your circuit breaker box talk to your Gateway plugged in somewhere in your house over the power line. Neat idea (seems almost magical really) but it causes more problems than it's worth.
For if there's any source of noise... such as a couple of compact fluorescent lights... your Gateway may not get the signal. This is very frustrating. In the end, I had to run an Ethernet cable all the way across my house in order to reach the distant circuit where the Gateway actually reliably got signals from both breaker boxes. AND I had an electrician run a wire BETWEEN the breaker boxes so both MTUs plugged into the same circuit. I was very close to getting said electrician back to put a single outlet on the same circuit and plug the Gateway in there. Presumably, that would have eliminated all noise. As you can see, you need to be prepared to spend considerable time on your TED 5000 project. If only they had just used wifi to communicate!
But maybe the price point would have changed. Another reviewer said TED 5000 is the best of its kind it this price range, and I suspect that's true.
Don't waste money on the display, if you're the kind of person who regularly looks at a computer (or iPhone, etc.) anyway. It's not good enough to be worth much extra money in my opinion.