Hi there! We have used Calvert in garde 3 and we found it too be too much work and we were stressed out. But yes, some people like it. It does end at grade 8 though. It is also about $1,000 and most of the stuff cannot be resold.
I highly recommend Oak Meadow at Oakmeadow.com. I only recommend it for grade 5 and above though. The lower grades are pretty fluffy and light and not alot of direction is provided. It's just kind of vague.
In grade 5 it gets more meaty. It is gentle, laid out well for the most part (grammar/composition is a bit of a pain, but we manage). Math is fantastic. There is not alot of busy work. It explains it VERY well and you do some practice and you move on. There is sufficient review throughout though.
It is basically written to the student so there is not alot of stress for the parent. Also, it is a homeschool curriculum, not a school curriculum that homeschoolers can use. I have found that trying to fit school curriculums into our lives was not working, so now I only buy things that are specifically written for homeschoolers.
Oak Meadow will be approx. $350.00 for a grade and can be resold on ebay. However, I am going to keep all of my Oak Meadow stuff because I love it so much!
Overall we really like it. We are currently doing grade 5 and will continue through grade 8. For high school we aren't sure yet.
There are MANY samples on Oak Meadows web site!
Good luck! I hope you find something that works for you.