I have had three take part in the Duke TIP program so far. It was absolutely NOT a waste of money for my kids. The oldest has now taken the tests "for real" and felt much more comfortable after having taken them before with no pressure. They all did well enough to earn state recognition despite not having seen much of the math before--and math is not a strong suit for any of them. The only prep they did was the sample questions in booklet.
I think the stress level also depends on your child and how you approach it. One of DD's friends got massively stressed, partially because of pressure her mom put on her to do well. Now mom will not even tell the girl what she made because doesn't want her to worry next time.
They have not participated in any of the summer programs, but one of DS's friends goes to Duke every summer and feels it is a good experience.
I think the stress level also depends on your child and how you approach it. One of DD's friends got massively stressed, partially because of pressure her mom put on her to do well. Now mom will not even tell the girl what she made because doesn't want her to worry next time.
They have not participated in any of the summer programs, but one of DS's friends goes to Duke every summer and feels it is a good experience.