Our district purchased Wonders several years ago and I like the reading materials a lot for second grade. However, I sincerely Wonder if anyone piloted the writing lessons for K-2 with actual children. Here is a link to a paper I wrote for our district adoption committee comparing how Wonders writing stacks up with the effective practices of explicit instruction. They were about to adopt it when I wrote this, so it had no effect. However, as I predicted, teachers have been frustrated with this part of the program.