[Brad]

Somewhat reasonable price, reasonable shipping costs, seems the center inlet would create some turbulence(due to the layout of the channeling),annodized fittings(large),extensive channeling, high water volume in the block to accept heat, good machining, nice looking, and (sorry to be controversial here) I like the idea of blending copper with a little aluminum for heat release

the price is average, and it isn't as if a couple of dollars matters. shipping goes in with this.
many blocks have a centre inlet, The maze2 would make just as much turbulance as the z4.
the fittings are small, and annodizing doesn't matter
extensive channeling, just like the maze2
water volume would be just as high in the maze2
the machining isn't that accurate bearing in mind the gap between the top of the channeling and top.
the al heat release thing is simply made up crap