I just received my copy of Mystery of History Vol. I. I am excited to start this with my daughter in the fall (5th grade). I looked for a long time at the Tapestry of Grace curriculum, but I couldn't justify spending the money with our small family. I was so glad to find MOH! It is an affordable alternative to Tapestry with a similar scope and sequence, and seems to be a little more user-friendly. It's definitely more kid-friendly. It is written so that kids can read the lessons for themselves. It seems that it is not as labor-intensive for the parent.
I especially love the 'What do you know?' pretests that encourage them to see what they already know and makes them curious, and the 'take another look' or 'what did you miss' reviews & activities - then there are quizes every 2 weeks, too, which test their knowledge. All of this is in small bites so the information isn't overwhelming. There are many activities to do. Each lesson lists assignments for 'younger', 'middle' and 'older' students. There are 36 weeks of lessons in this volume. The author lists several examples of how organize your week.
You will need to inlcude real books from a library (or you can buy some) to flesh out the lessons - but the same goes for TOG. I plan on making a time line as well.
The only negative I can find so far is that the 5th (last) volume will not be published in time (planned for release in 2014 or 2015 ?), but we can find a substitute curriculum for that last little bit of history - no problem. The 3rd and 4th volumes should be released in time for us. (3rd this spring and 4th in 2011.) For more info you can go to the MOH website, but don't buy there. The prices are better elsewhere.