Having been extremely sceptical about Smart Meters in the past, when my electricity supplier informed me my electro-mechanical meter was 25 yrs old and needed replacement, I decided to give a Smart Meter a chance.
The new meter was installed within a week by a cheerful installer in less than an hour.
The inside display is useful and seems to work well so far.
Having the Smart Meter now entitles me to Peak Save rates which give half price rates on Sundays between 11am and 4pm, so all seems good.
I have yet to see any downside!