I would put the Z12 just above a Marker. They are not the same quality as the 912 models.
Me too. Actually...I haven't skied a Marker binding in many many many years so I can't really have an informed opinion on them, but for me, the Z12 is at the bottom of my list. I've broken them (cracked/broke both binding simultaneously in the pair) when I really needed to depend on them. The materials just can't (or couldn't the first year they were released) hold up to really agressive skiing.
Solly 916's and Rossi FKS/Look turntables are my faves. With a slight nod going to the 916's just because they're bit easier to click into in deep snow....but the Look/FKS are lighter which is nice.