http://www.mackinac.org/article.asp?ID=6653 excerpts:
An impartial academic study of 20,000 children in 1999 found home-schooled kids at third grade level could read as well as public-school sixth graders. Home school students also scored much higher on the respected and much used Iowa Test of Basic Skills.
Without government money and with few regulations home-schooled children are usually outperforming their peers
Home schooling parents also, by the way, save Michigan taxpayers an estimated $600 million per year because they impose no costs on the government-run school system.
