I have some personal experience here as well; I also scored in the 99th percentile on pretty much every standardized test I was offered. My parents did an admirable job of ensuring I was placed in the most accelerated academic programs available in my public school district, but even in that environment I was frequently bored and depressed.
I'm not concerned about "achievement" and "potential" because I know from personal experience how pernicious those expectations can be. I just want my son to enjoy his educational experience and emerge into adulthood with a firm understanding of his strengths and weaknesses, and confidence in his initial career direction whatever that may be. I did not get that from public education, even the accelerated track, and I suspect that my son would not either.
Of course I am doing a lot of my own research, but it helps to hear personal experiences of what worked well in specific situations to guide that research. Parents of gifted children of HN, how do you help your child get an appropriate education? I'm open to all options.