I installed a Graffiti Motorsports "K" harness bar in the Z.
Build quality: 5/5 - Sturdy construction with what appear to be strong welds.
Design: 4/5 - Relatively unobtrusive but sacrifices some space in the boot.
Fitment: 4/5 - One of the holes on the "leg" that bolts into the boot floor does not line up properly with the hole in the boot.
Presentation: 5/5 - Nice glossy black finish.
Now to sort out a harness.
Some other images here.