hi - we use it and have a love/hate with it. however, i will stay with it...i have 5 kids, aged 11 to 1, and we are in our 3rd year with it. i did find, starting in 4th grade, the writing is a bit weak, and i am getting a book to help me to supplement that. there is a lot of writing but not enough instruction, just here, write a compostion on "this topic"
umm, you can't beat the structure, and lesson plans. price is high, but a fraction of catholic here (around $4000) and private school ($16,000). with a bunch of kids, it is great for planning, testing etc. but hard to use and teach multiple levels. thankfully, my oldest is pretty independent with her work. the 3rd boy, not so much!:) the first grader, once she is a better reader, will also be very independent. and then 2 little ones, making messes, and keepin' it real!
good luck ,amy