My DD7's pull-out is half the day every day, but it still suffers from a lot of the shortcomings illustrated in this article. They take the qualifying kids from 1st-3rd, throw them all in one room, and work on all the same content. If you're not going to differentiate with only 9 students in the room, a three-year age span, and a qualified gifted teacher, then when are you going to?