I was unschooled from 1st grade through high school. Overall, the experience was great for me. I had time to do a bunch of different things (boat building, blacksmithing, metal casting, programming, ice boating, climbing and hiking, firework making). I'd simply not have been able to do all these things to the degree I did if I were studying 6 hours a day. That said, it made applying to university hard. I ended up going to a pretty bad school, the only place that would have me. I had gaps to fill once in university, but managed that quickly (earned a 4.0 my freshmen year).
However, I know people for whom unschooling was a disaster. They feel they were neglected and missed critical education. I will not unschool my children.
Oh, and I can't spell. Many unschooled people seem to be bad at spelling.