I've had a SMETS2 meter installed almost 3 years ago (upgrading from a SMETS1 meter). In total I've had a smart meter for around 10 years. The flexibility they provide is huge and, of course, some of the most advantageous tariffs have only been available to those with smart meters. Once the market settles down again, hopefully next year, then a SMETS2 smart meter is almost going to be essential to take advantage of the cheap off peak tariffs which, combined with home battery storage, will offer rates so cheap that even heating my house by electricity will become viable.
My SMETS2 meter tells me my usage for the day, the week, the month and the year. It gives me a total usage by both kWh and cost and, as well as a combined total, it will also give me separate electricity and gas totals.
As stated above, it depends on your energy provider as to how much extra information you can access.
I'm also looking at battery storage and I've also been looking at the Octopus Go or Octopus Go Faster tariffs as the most likely ones to move to (however, in the current climate, my current fixed rate is too good to give up until it runs out next year or my supplier goes bust).
I will be using this winter to gather some useful information on my current energy costs and also the cost of some potential changes I could make. For example, I have two air source cooling and heating units which, currently I only normally use for cooling in the summer (and very occasional use for warming in the winter). I will be trialling using these for whole day heating in the winter, to get an idea of the price point at which they will become cheaper than my gas central heating system. This will inform my final decision on whether or not to invest in storage batteries (or at what price point to do so), as well as when it may be viable to move away from gas central heating completely.