The benefit is in the mean time you get an accurate bill no faffing reading meters and being in credit/debit etc.
Oh come on, it takes 10 seconds to read a meter, rather than having an out of date bit of tech that cant be used by all providers.
I can see when the dial whizzes around at the moment how much juice we are using, when it spins slowly it uses less than when it spins round a lot.
The only benefit of the tech is for the provider. So they can charge more depending on the time of day etc.
We also like being in credit as Ovo is probably the best savings account out there at the moment being tax free and 3% interest.