Against my advice, my mum had a smart meter fitted last September. She thought it would make life easier for herself and for me, as she would no longer have to take monthly readings then phone me with them so that I could enter them on her online account. She also thought it would be useful to be able to see how much energy she was using at any time, via the in-house display monitor.
It didn't take long before she unplugged the monitor and put in a drawer - from the information it gave, Mum was convinced she must be using far more energy than she really was, and she became quite worried about it, even though I keep an eye on her account and tried to reassure her that her usage hadn't increased and no, she was not about to get a demand from her supplier for a lot more money.
The next problem could come when her present energy contract ends in June and I (probably) need to find her a new supplier.
If the smart meter no longer works, she will not be able to take manual readings, because with the new meter, even if she manages to press the right button to make the reading show, she can't see well enough to read it. As I live 120 miles away, I am not going to be able to do it for her!