DS never spontaneously complains of boredom. He could entertain himself for hours with a shoestring. The red flags I saw in him in K were much more subtle than overt unhappiness. It was comments like "I don't learn anything in school" and contentment with review of stuff he knew several years before and perfectionism that got me concerned. That's why I love the "extreme" stories on this forum. If I didn't hear very sad stories about underchallenged kids who burned out I probably wouldn't have even thought of gradeskipping a happy child. Likewise, the stories on the other extreme about HG+ kids doing well in PS with not much intervention help me to not panic when the situation isn't perfect. I want to hear stories about A, Z, and everything in between...