I had a bad experience with Z1 at the end of last year when I had to buy a replacement 4.08 diff gear set and they didn't package it properly. The way they packed it caused the pinion to hit the crown wheel and damage each other! After much stuffing around, emails, photos etc, it was all replaced and the next set was packed better and was ok. I was still a few hundred dollars out of pocket for the extra shipping costs which I had to wear, let alone the extra time all this took so I didn't have a car.
