My DS11 skipped a few years ago, and is now in 7th grade. He is positively thriving, and there has literally not been one negative thing about it. In the least, one skip wasn't enough.

He is not a social butterfly at all, but he has made friends who have similar interests. He finds them immature, though, but tolerable. The fact that there are nearly two years older has helped.

He also has very strong EF skills.

I do wish that DS did early entry, so that way he could have fit in another grade skip.