Have had one for coming up to a year, from Ovo.
The in home display is all but useless, and they admit this.. current usage is wrong, expected bill amounts is wrong and none of the numbers tally with the online portal - updated daily and IS accurate as thats what they base the bill on, and agrees with my other energy monitoring using OpenEM.
BUT
The information on the online portal is good, I like the granularity of the data and being able to nose at history:
Sunny day, sun hit solar panels around 10am and stayed on them till about 7pm:
months worth of gas usage, can easily pick out which days people are home/its cold:
Then clicking on a single day that had high usage to see the distribution.
5am is hot water tank warming up (before showers in the morning), same at 5pm (before kids bathtime). Others are heating coming on.
Its quite nice (as a data geek/analyst) to be able to poke into the data at this level.
Now, since the smart meter was installed I have installed my own build of an OpenEM (Open Energy Monitor -
https://openenergymonitor.org/ ) and this far outshines the smart meter for electricity, as I can see what my solar is doing too, but no info on the gas.
Horses for courses, but I for one *would* let them install it again given the choice knowing what I know now. Its nice not having to take meter readings, its nice being able to see how my usage is shaping up day by day with regards the bill, so no surprises.
The in home display lives in a draw now, not used. As I said above it doesnt work, OVO are aware of this and will be releasing a new version at some point BUT customers with the old one WONT get the new one :/ .