The knock I've seen against these smart meters--and I haven't been able to verify it--is that they're really surveillance devices, in that not only do they report power consumption, they can identify when particular appliances are in use by the load characteristics, track patterns of activity and movement throughout the house by things like lighting usage, and build up a database of the pattern of your life, like when somebody's home and when the house is empty and what hours you keep. As I say, I don't know whether that's true or not, but if it is, these things are far smarter than they need to be for their claimed purpose, and it's a pretty serious invasion of privacy.
Some of that might possibly be true in some houses. I have lots of power tools including welder and some of our house uses solar just to keep a load on the batteries. In any event there is much more personal data to be mined from facebook and twitter or even hacking cell phones than what electric meters will reveal. Hell if you use a wireless router in your house not only are you exposed to more and closer radio waves than a smart meter you are also much more susceptible to hackers.