I think that's a bit of a black and white declaration. My dds are both highly gifted (with IQ test scores as well as achievement scores in the 99th percentile - 99.9th). One of them has had mixed experiences, but with significant acceleration is having a good experience at this point. It's not perfect and she's not being seriously challenged in many areas, but it is fairly good. It just takes a lot more atypical accommodations in her situation.
Agreed. There is nothing that points to my eldest being NOT "truly highly gifted" (with her IQ nearing the HG/PG line, achievement scores off the scale as well, plus reams of exceptional accomplishments), and her school experiences have been overall pretty positive. She's not "seriously challenged," but she's happy and she's learning, and she gets plenty of serious challenge in other areas of her life. So it's all good.