For me it was worth it.

At home we didn't think there was anything wrong with Mason but in the kinder environment it became evident that he just wasn't wired the same as other kids. It was recommended that he do another year of 3yo kinder as he wouldn't have the coping skills to move up and it's harder for them to do a second year of 4yo without going assessments that would "label" him so to speak. It has helped him prepare for 4yo kinder much better.

Angus on the other hand has benefited from 3yo kinder because he has that time with his peers and is learning that his brothers way of doing things is not the only way IYKWIM. He is becoming more of an individual and not a Mason mimic