@mfisher702 - I started with Benjamin modifying my Mac mini years ago and have owned his Mystique v3, B4B21, EVO PRO, and X SE.
I have kept my EVO PRO which has the (more highly sought after) Z-version of the AD1862 chips and sold the others. However, I would like to hear an X SE with my Z-chips in it to compare.
I would also like to hear the Mystique Y NC DAC since Benjamin speaks very highly of it but unfortunately I am not sure a DAC with only a USB input would work well in my system. Based on what I have heard from his other DACs, I am sure it sounds great. Enjoy!