Well obviously i don't know anything about the Z15 shown there because it isn't available yet, but i do own a Z11 plus and honestly the build quality is surprisingly decent. They do use a bit more plastic than i would prefer (on the front) but that being said it's very thick, stiff and rid-git and im yet to actually do any damage to it.Zalman makes some weird stuff. Have had one of their cpu coolers but haven't seen any of their newer cases in the flesh, wonder about build quality.