I actually went to Kunskapsskolan as the equivalent of a High School student. Graduated in 2005. It work out very well for me, the freedom to go about the curriculum at my own pace suited me perfectly. The experience of going there was very much like what you would find at a university. The school demanded a very high level of motivation and discipline. And this makes it problematic, since quite a lot of students at that age were ill prepared to face that.

I might be hesitant to say that this reform has worked out well for Sweden as a whole, as I think for-profit entities in charge of public education is a step in the wrong direction.