The way I see it is that intelligent is basically the 'end game' of EV charging and if you want the cheapest rates, you'll have to use it.
Does seem pretty good... I was actually surprised when I did the maths and found that (assuming you have an electric car to charge!) even the basic Octopus Go with it's seemingly expensive 'main' rate for 20 hours does save money overall, or would for me at least, about ~£20-25 a month I think, and that's not a huge amount of charging really at ~160 miles a week.
Didn't actually think I'd be getting an electric car anytime soon, like decades, but giving it some serious thought now