I am not one for too much government intervention, but I really don't understand everybody jumping on the hysterical bandwagon of "I am not getting a SUBE card because I don't want Cristina knowing my information or where I travel to".
First, nothing of any significant value is being purchased with a SUBE card so nobody is going to calculate your income by how many subte or collectivo trips you take.
Second, just what are they going to do with that information as to your subte route and collectivo travels? It´s not like anybody can fly out of Ezeiza on a SUBE card.
In New York city I remember almost the same hysterics when the MetroCard was implemented back in the late 1990s. And you can buy a MetroCard anonymously, except of course when you purchase one with a debit or credit card, then there is a way to link the card to the purchaser. There have been several cases of the police being able to solve crimes by knowing the movements of a particular MetroCard.
The advantage of having the SUBE card linked to your personal data is, if it's lost you can cancel the balance and have it transfered to a new card, and the police can track the card´s movement if you are robbed of it.
So let's all join in and participate in this long awaited and much complained about (remember the moneda crisis) issue and get our SUBE cards. There is no reason not to unless you want to pay a higher transit fare, of course.