4GB for $70/month in just data? Holy crap, for real? I thought prices were supposed to go down, not up. Currently, 4G data prices are 3GB/$30, or 5GB/$50. So as a single user, you pay $40 for voice, and then $30 for 3GB data package. Voice + data is $70--which is the cost of just data for a comparable amount of data on this new scheme.
Even for a "family" of 3 people, to have an equivalent amount of data available compared to current data plans, you'd have to go with the 15GB/$160 plan, plus $90 for all the devices (assuming only 3 phones). $250 total with this scheme vs. 3X$70 = $210 now. Even if you went with the cheaper 10GB/$120 plan, you're still paying more than current individual plans. Of course, the cost of the "shared data" plan would go down if users didn't need that much data, but one must ask oneself, if users didn't use the current data plans worth of data, why are they given it in the first place?
You only honestly get better prices if you have like 50 devices on one account. I'd love to see a breakdown of AT&T's customer demographics--how many single-account users are there vs. family plan users. Because it seems to be a bunch of crap that this benefits the customer. As expected, it benefits no one other than AT&T. Not that that wasn't expected.