I ordered this over 10 years ago (perhaps the longest I've ever waited for a pre-pub), and I'm still very interested in it. It contains the monumental tome Martyrs Mirror. Many of the other books in the collection are also classics: The Anabaptist Vision, An Introduction to Mennonite History, Confession of Faith in a Mennonite Perspective (while available online, it would be nice to have this integrated into Logos), and The Complete Writings of Menno Simons. Naked Anabaptist: The Bare Essentials of a Radical Faith, while available already as a stand-alone, would be cheaper if acquired through this collection.
https://www.logos.com/product/23994/anabaptist-and-mennonite-studies-collection