nope, I got there 630 and they were not letting in after 6, I gave my friend's the tix and went with my wife to d and b and le marais.
Once they start taping they usually wont let you in. They start taping an hour after the tix say. For example, the 2pm show on sunday will start taping at 3. They moved it up three hours.
BTW can someone change the title of this thread to American's Got Talent Master Thread.