Happy with mine
I got a smart meter from Eon a few months ago, they sent a letter through the door asking if anyone wanted one. I did so I requested one and it took them less than half an hour to remove my old gas and electricity meters and replace them with the new ones. No cost to me at all and all my readings get sent automatically to the supplier a few times a month.
The meter and wireless display that is in my living room cost 16p a year to run and was of course installed and supplied for free, You dont even have to have the wireless display running if you dont want to.
Regarding energy saving, I have found that it does indeed help energy saving, for instance I found my microwave was drawing too much power and was faulty, so the meter helped me in that way. Also, I left the iron on once and only noticed when I walked into my living room and saw the display showing up as red(using lots of energy) after hunting around for a few minutes I found the iron on in the spare room, I could have left that on for days if it wasn't for the smart meter, so already have justified several years "running costs"
I really don't see any reason why anyone would object to having this installed, except maybe security concerns with the unit itself, I don't know why anyone would want to hack my smart meter though and cant see what they would get out of it.
It really has opened my eyes on what appliances cost a lot of money, boiling a full kettle takes more energy than a full washing machine cycle at 40 degrees, not what I expected.