i have the black ceramic with blue dial and bezel and i havent been overly impressed i'm very sad to say. the bezel is very loose, the crown went bonkers and i had to return it for repair.
i wish i'd gone for the clear model as the alu ceramic is only a coating and i managed to cut into it by accident.
on the other hand, it didnt cost much so i shouldnt complain.
i came across a guy on the bay the other day who has developed a way of cutting the swatch cases apart, remodelling a caseback and fitting with better eta auto movements. still waiting for the sistem 51 though.
best
G