I put DD in a 2s program when she turned 2 in Sept. And I do not regret it. Although I had "buyer's remorse" the first couple of weeks. Her separation issues lasted a few days only, I was crying as I left for 3 weeks.

As an extrovert, she really liked being with kids but it was a playgroup. And I recommend that at this age. Even though she started reading and was ahead, just the whole play, socialization is something that is age relavent.