They are very good if and only if you get the STH Driver toe. Salomon makes 2 models for the STH binding, a Z toe piece and a Driver toe piece. The Z toe breaks and is really shitty, never get it. The Driver toe s considered one of the best toe pieces on the market because it is quite durable and very adjustable.
Compared to other bindings it is fairly good, Rossignol FKS / Look Pivot are very popular bindings because of their great heel piece.