We used the K12 Curriculum. I think their Art and History and Music and Science were extremely complete.
I can not see us signing up for another year of their Phonics or language Arts both were so dry it was hard to get through and their ongoing annoying math chatter from their online course made my kids fussy both of my kids complained consistently about Language Arts, Math and Phonics.
We switched out of Music into Spanish as soon as they allowed it because neither of my kids were interested in Music.If your child will be taking music lessons its a nice music course as a detailed introduction.
The Spanish was interesting it did tell stories and did games. The teachers do respond quickly and the class connects and optional field trips are nice.
They are really big on socialization online groups and meet ups in person . If you want constant contact they give lots of ways to get a hold of them and they are polite.
Grades used k,and 2nd .2010-2011-2011-2012.