We started the Prairie Primer when my daughter was 11years old. She'll be 12 soon and we will be done with the PP soon.
I have enjoyed doing it with her and feel that the education is much broader than what a textbook could offer. I like the pace that it's set at too. Sometimes I wish that we'd get going on a tangent but we just usually don't.
I have my daughter do dictation from a few small paragraphs from the reading selection, add math & grammar. She reads freely.
I think I'll be ready to return to the Beyond Five in a Row curriculum when we are done with the PP. THEN - perhaps Switched on Schoolhouse.
We are doing a very brief use of the SOS at this point. So far, she does not like it at all!

