Experience with K12 Curriculum?

I used k12 2 years ago for my 2 kids that were homeschooling that year and mostly liked it. We did it through the school district so we didn't have to pay the hundreds to get all of the curriculum. That way was nice b/c they provided everything, but a pain because you also had to do the daily attendance and breakdown of how much time they spent on each subject each day (for required hours/subject and required days of attendance). We also had to do the standardized testing. But doing through the district also opened us up for a lot of the extra activities that they set up in conjunction with other home schoolers using k12.
My kids were 2nd and 3rd grade the year we did this and had both attended public school the year previous. My 2nd grader is quite advanced, and had already skipped one grade, so I loved that I could customize her subjects. The placement tests were fairly accurate, and it was nice to be provided with 2nd grade math, 3rd in science and 5th grade lit and language and not have to just buy an entire program on only one grade level.
There did seem to be a fair amount of busy work with some subjects, so I did have my kids skip over things at times. It was also nice that they didn't mind (and in fact encouraged) skipping over concepts that were already mastered, and even sent the next grade level if you completed a subject before year's end.
It was fairly involved as far as I was concerned-more than I expected-which was a challenge for us with the other things I already had going on. I wish there was more that they could have done independently, which apparently is the case as the grade levels get higher.

So yes, the customizing is easy and helpful. The curriculum can be a bit consuming, but you get the hang of it. Would I be willing to use it again? Probably. There were some courses I would not do again (the music course was AWFUL!), but others that I thought were well done.

We tried K-12 for about 6 weeks. My daughter was in 6th grade and came from a charter school with Core Knowledge curriculum. We knew that she had reading issues and was approximately 2 years behind. K-12 does place them where they need to be academically, the only problem being that you, mom, will need to be right there pretty much every step of the way. K-12 didn't involve as much online learning (less than an hours worth daily)as we anticipated and we spent at least 6 hours every day sitting and doing school work from textbooks and workbooks. In comparison to the Core Knowledge curriculum that we were familuar with, K-12 was at least 1 year advanced in what CK taught at each grade level. K-12's curriculum was fantastic, but I was "mom" and not the teacher, and it was very frustrating for both of us. If they don't pass a particular subjects test, you do it over and over until they are proficient. We ended up quitting K-12 and repeating 5th grade in a traditional public school, (different district than prior school), just to get her caught up (she had been one of the youngest in her class) and it was the best decision we could have made. It really helped get her confidence level back up, and she isn't being bullied by classmates or teachers in her new school. She seems to be more of a leader than a follower now, and is doing great. We have been at her new school 2 years now, and she is doing extremely well. She is on the "B" Honor Roll, and has very few accommodations made for her learning disability. And, I can be "Mom" and not teacher and that has helped my stress level tremendously. Hope that this helps you with your decision

K12 is fairly notorious in the HS'ing community. We used it for awhile and quit (fortunately we were on the month to month... so we got to try it for awhile and not be out a lot of $). Since they don't do trials, I would suggest signing up for a monthly membership to try it out.

The reason they can make the claim, is that unlike school-in-a-box you can have one student working on multiple levels. So Grade 1 for math & Grade 6 for English is possible. But you can do that with ANY eclectic curriculum (my kiddo is in the opposite boat, he's a numbers guy... so we're doing 1st grade reading and 5th-7th grade math). We had had high hopes of an interactive curriculum, but for kiddo's levels... it was essentially just worksheets on a page. Limited if any interaction.

We use a combo of Montessori, Singapore, & Computer Games (like ClueFinders) for math. Others that get rave reviews are Math U See & Time For Learning. I don't have any experience with those... but here are the links to what we use:

http://www.freemontessori.org/?page_id=9 check out the Albums links (aka curriculum in montessori lingo). Like the name of the page, they're all free to download, and several hundred pages each.

http://www.borenson.com/tabid/933/Default.aspx

http://www.singaporemath.com/

http://www.amazon.com/ClueFinders-Education-Childrens-Sof...

I know nothing about the k-12 but sylivans learning center helped mine a whole lot. amazing results but expensive.

I do not have direct experience, but my cousin is using the online curriculum with her daughter. My cousin hates it. She had the understanding that it should only take 6 hours tops to do the schooling and it has turned into 10-12 hours a day. With only Saturday off. When she signed up for it she didn't realize that school was for 8 hours and then on top of that there was the homework hours. She does like the fact that her daughter gets tutoring with the program and so the subject that she is struggling in that is what she signed her up with on tutoring. Good luck. My recommendation is to supplement some math exercises in every night for about 20 minutes or so. You can find free printables on the internet or you can go to the dollar store and get math workbooks for what she is struggling in for a dollar a piece.