I have not personally used it, but I've received students transitioning back into b&m school from it, and they generally make smooth transitions. It's been a lifesaver for a couple of my friends' kids, who had various challenges with b&m public school. I did look at it for our own, in the process of homeschool research (ended up using mainly eclectic paper curricula with self-made supplements), and would have considered it if we hadn't been able to work out a schedule for a parent to do more direct instruction at home. It's often on my shortlist of recommendations for newbie homeschoolers, especially those who might be more likely to drift back and forth between home and b&m public school.
I think HowlerKarma used it fairly extensively, a few years back, but HK posts here only sporadically these days, so you may or may not get a response.
