We enrolled in the K12 program after spending 8 years home schooling then 3 years in a private Christian school. The private school was college preparatory and quite challenging.
My children did very well in the strong academic environment. For this reason we thought K12 would be a step down for us and therefore doable to implement with our schedule that involved traveling for a two year period. This has not been the case.
It is very time consuming. I would say it is like carrying the brick and mortar school on your back. Everywhere you turn there is another deadline, benchmark, or expectation. And all this in what is suppose to be a more freeing schedule. Just understanding the program and how it works takes all the time a home schooling parent has. Expecting your student to navigate on their own is impossible. WAAAAAYYYY to much information to keep up with and one parent, in a home school setting, cannot be expected to do this.
For these reasons I withdrew my 4th grader before the first semester was over. Because my 10th grader must have credits to graduate, or return to another school, we are wearily trying to finish out the school year. Her status as an A/B private school student has dropped to a C/D/F student. Biology and math courses are very hard to succeed in via the internet, at least the way they are designed with K12.