Homeschooler's Using Kumon?

Kumon is a supplemental educational service for children, aimed at improving their mathematics and reading abilities. It's not considered a tutoring service, which is where it gets confusing... lol It's a system of packets or daily assignments (15-20 minutes) beginning with very basics (to encourage self-esteem and build motivation) and advancing slowly over time. They take very small steps and tell you not to expect big things right away. It might take a few months, possibly longer before your student is up to speed with their grade level.

My son is in the 4th grade and nearly failing math. He's excelling in nearly every other subject, but doesn't get multiplication and division.  It think we're going to sign on with Kumon (has a great reputation) and then find a tutor to help him with his current assignments. Our son refuses to let me or his dad help him with his math. He puts a wall up and breaks down emotionally. So... we must not be doing something right. I'm not sure if he feels threatened in some way??? His sister excels in math and his dad is an engineer who is such the math brain. Maybe that's the problem?

I wonder if anyone reading my blog has any experience with Kumon? I'd love to hear your take on their services... good and/or bad. I believe the success of a child depends primarily on the level of support and encouragement they receive from family, friends, and teachers. Having additional supports in place for my son (who has Asperger's Syndrome) only makes sense to me.