Replying to Rossignol FKS 120?

I know NS is plastered with questions about these bindings but I'm just seeking a little advice. So I weigh about 145lbs and currently use squires, (got them when I first got into park) I have been having a lot of problems with the brakes literally just shattering for no reason and I've been thinking maybe my ability has exceeded the binding's capability.

So I'm looking into the Rossignol FKS 120s, I've been reading a lot of reviews and asking shops about them and it seems they would be great for me.

My main question is how durable are these in comparison to the 140s?(less metal I hear) and how reliable are the brakes? Thanks