Here is my Robinson Curriculum Review. I looked at it quite a few years ago and regret that I didn't start using it then. I am using it now and feel like I am finally "home".
The curriculum was developed by a homeschool Dad after his wife suddenly passed away and he was left to homeschool his 6 children.
I like it because it is a simple approach. It is not easy, but it is simple. I also like the fact that there are audios and articles you can use that help you understand the philosophy and give you ideas on how to implement this curriculum in your home. The students that use the curriculum have a high level of success both in testing and in real life.
The only drawback that I can see is that you might not want to adhere to the time constraints outlined in the curriculum.
My review of the Robinson Curriculum is that I highly recommend this self-teaching curriculum.
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After a few more months of use I have to modify this review a little. Although I like the philosophies and ideas presented in this curriculum, I still don't print the books. I have collected many books before I purchased Robinson, and I'm just as happy to use what I have on hand.
I also do not "require" my children to sit and work for 6 hours. My teenagers do that on their own, but I don't mandate it. I found that my 7 year old HATED math flashcards, so I have adapted that program as well and do some math related activity each day, but not flashcards. It just wasn't worth it to me for him to hate learning.
I guess with any curriculum you will need to adapt it to your own needs. This is how I have adapted Robinson Curriculum in our home.