DD is not a good candidate due to socioemotional issues. I've never seriously considerd it, though if I HSed her I would certainly have her working 2-4 grades above level.

DS is only 4, and has not entered the system yet. I suspect he would be a very good candidate on the IAS. Actually, I can't think of a single reason why not. He is tall, fairly athletic, pretty even-keeled, and has great handwriting for a boy who just turned 4. The academcis are 100% there. However, I am theoretically pro-skip all the way, and yet find myself feeling anti-skip for my own kid. I guess all that anti-skip brainwashing dies hard.