My dd took it from the time she was 18mos till 5 yo.
she loved it, though I wonder if she would have really liked any music program as she loves music anyway she can take it.
She did not finish the last year as we didn't want to overschedule her and believe in letting her choose-she chose dance instead.
She has an amazing ear for music. We wonder if it was KM or just that I have always had music on and am always singing(you know, stupid little tunes to sing about what I doing...
Km was way out of our price range...financially, it was ridiculous that we invested that much(she BETTER continue to do well at math!
We did have a good teacher who verbally encouraged children to be who they wanted to be..and for parents to not push their kids..she always said to just play the music everyday and they would absorb everything.(duh!)
We saved all KM materials, and we do music play at home now with ds who is 17 mos...but no WAY would I put out that kind of money again to do what i can do at home and take ds to park or free playgroup to have interactions.
IMHO however, under 2yo is too little to have a whole lot of success wityh social interactions!!
BTW...you can order KM materials w/o being a KM student.
My tiny input,