i wear mine on my right wrist, and my watch on my left. i tried wearing them together on the same wrist and lasted a day. it just bugged me. like others have mentioned i think the constant rubbing up against it would drive me insane. not necessarily because of scratches but just because it would be uncomfortable.
I wear it one my right wrist. wearing it next to a watch doesn't look right. I prefer wearing my cartier bracelet alone so it remains the focus of attention. the only thing i would wear next to it is another carter bracelet in WG.