I have looked at the Z32 a couple of times, but there just are not any long-term reviews that I can find and the low spoke count (16/20) worries me (I know they are not normal spokes). Also one review of their GX gravel version (24/24 spokes) talked about the wheel "winding up" under power during accelerations. Not sure I want that.
The prowheelbuilder site does look like its pretty price competitive with anything else I have seen.