WOW just been on the thread it is crazy! you either love KUMON or hate it, to me it looks like if your child needs a bit of extra help go for it. Then when they catch up with our help too walk away and enjoy 10mins every night with your DS yourself. These people need to chill out! i I must admit the only way i learnt my times tables was repetition.
We looked at it and decided to do Komodo instead which is an online maths program. It is also more sums than maths, but can be done in little chunks at home (DS does 10 min a day) rather than a lesson somewhere and is considerably cheaper!
It doesn't have to be expensive if you buy the kumon workbooks and do them at home.
I find the way maths is taught is too fragmented and confusing, even when they understand it, they don't practice enough to really secure their knowledge and build up the speed.....kumon is great for complementing/ supplementing this gap, IMO.