One problem is that the smartmeters often don't work properly and so you can't really control your usage and bills. Rather than being 'in control' you are at the mercy of whatever they want to do at their end and readings and bills might well be wrong, or keep changing. It is also very hard to get such problems resolved and they continue for a long time with new twists and turns. You are likely to be blamed, but the problems continue. Communication can be difficult and stressful. I've had this situation for years and I am anxious to find a more reliable supplier.