We are having a great time using this curriculum. I have only encountered one broken link so far, but am only about half way through the first series of lessons. This curriculum is being used with one individual student (second grade level) and I think that one similar will work very well with multiple children, as many of the links lead to premade lessons for classrooms. I will point out that I haven't had to purchase anything particularly special, and things requiring purchases have been adaptable for use with things around the house, with a little ingenuity. I will point out that I have emailed about the broken links and have gotten no response, but it hasn't been problematic yet in this unit study (my issue is with a social studies unit). I would easily rate this a five, if only I could get communication and the links fixed.
[4 of 5 Stars!]