I use Fiebing saddle soap on mine, and it works great. But I am very familiar with it and use it on all of my hiking and hunting boots in addition to bison leather.
On the AE website one reviewer said he used Mink Oil to waterproof his. Because I had good success with Obenauf's leather oil on my AE Eastport's, BB and Bean Bison leather boots I thought I'd use it on the Black Hills. Don't do that, the leather God's were not happy. After almost 2 weeks of a nightly cleaning with Fiebing saddle soap I got them back to where they were to start with. However Obenauf's HDLP works perfectly if you want to waterproof them.