I'm in Colorado also with a 5th grader in Branson Online (also a public online school.) This is her first year. The middle school in our area is horrible and we are rural so didn't have any other choices.
My experience has been, there is WAY MORE WORK in this program than there was in the traditional school. (I have volunteered at her school since first grade, so I know what I'm talking about.) It seems to me in traditional school 1, they knew the kids were there for X hours per day, and 2, alot of work is done with the class as a group, and with the teacher guiding. In the online school (since it is still a public school of the state of Colorado, strictly regualted) basically the only way to "regulate" it is the amount of work the kids are turning in. And all of the work is done individually, and not as a group.
I wanted her to have the same level of education - I didn't expect her to have to work HARDER than she did at traditional school. And fyi, she was and still is an A student, so grades weren't part of the reason we switched.
It definitely hasn't been what we expected. I have talked to other parents who switched from traditional schools, and they also have had the same experience.