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I personally don't like them; I would prefer to have my seats custom fabricated rather than just cover them up, but that's all relative to your budget.
I personally would stay away from any leather goods on ebay. Specially ones you can not see or feel in person. Search around and I think there's a few threads on this subject already. Also, a buddy of mine got all the seats to his F150 leathered from a furniture upholstery shop. The quality of the leather and work was awesome and he had a mountain of selections to choose from. If you think about it there's really no difference between leathering a chair vs. the seats in your car.
Did you even look at the pics? Just look how uneven the stitching is around the handle on the back of the seat. Also, look how uncentered the opening is over the side airbag. It's blocking the airbag. Looks like shoddy workmanship.
Several people have a kit from them they are always on ebay selling their kits pretty cheap about 500-530 for the Z, Ive only heard good things about them and its who Im going with here pretty soon.