i was reading up on smart meters a few months ago and in if i remember rightly it was in Holland the people kicked up a fuss due to security of the smart meters, they were saying that the companies receiving the data know when you are out of the house or on holiday as you obviously don't use any or hardly any electric if your not there due to the electric readings being sent to the companies every 15 or so minutes 24 hours a day.
Plus they were concerned about this information being passed onto 3rd party companies saying you may get hasseled by security alarm companies etc. if your electric data is being passed on to such companies.
I personally don't want one but if they are to become compulsory by 2019 i will have to have one but not until that year.