I know Inky! I did have to hold myself back from joining their conversation! My son repeated PK4 at the recommendation of his school because of social immaturity despite admitting that he was ahead of the others academically. The following year, we had him tested and found out he is gifted (in hindsight we should have known, but we thought all kids were like him!), and we could have kicked ourselves. I really wish we'd known more back then. Once he made it to KG we had to pull him completely because it was a nighmare. He was quite insulted that he was asked to do babywork all day. I came to the conclusion that ds hadn't learned anything in 2 1/2 years at that school, and we cut our losses. Now that I've spent some time homeschooling, he's solidly in at least first grade. He will begin Montessori school in January, and they assure me if they see that he's way ahead of the first grade curriculum, they'll cut his time in the primary classroom (1st-3rd gr) by a year. It's the best we can find right now, so we're really keeping our fingers crossed. I so wish I hadn't listened to EVERYONE'S advice of giving my son the "gift of a year." What a crock!
Of course, I feel like I should have known better as well!