As far as I am concerned a complete waste of time and effort. We had a smart meter installed 3 years ago. It was worked for six months, although we never looked at it. We have always been energy aware, I had worked in the industry, so our house was already as energy efficient as possible, and so were we.
Anyway, six months after it was installed we changed energy supplier. Each smart meter is particular to the energy company that fits it. Change your supplier and the smart meter is instantly useless. So after six months our smart meter became useless. The meter reader for our current energy supplier comes round and reads our meter as before and the display unit we were supplied with is at the back of one of the kitchen drawers.