There were 3 z3 stocks.... the original Z3 with +40mm bb rise and vert dropouts, the +60mm one with horiz dropouts and finally the +75 one that's identical to the +60 in every other way apart from finish ) anodised instead of painted.
Mark, I believe that was Canardweb's ( simon Kuchesberger , [sp?] ) old bionic. I have seen a couple of pures snap there ( they have identical downtube gussets I think? whereas the Zhi has an open ended one that better serves to dissipate the stress I think.
My zhi seems fine, no real issues with it and being as tiny as I am it fits me perfectly. Fact, the z3r is only 10mm shorter in the reach that an Echo pure 2011, so not exactly a huge difference.