Orthognathic surgeon recommended silicone cheek implants during surgery. Is it a good treatment & do pros outweigh cons? (Photo)

-Currently have Class III underbite -Had braces and reverse headgear growing up -Preparing for orthognathic surgery (one surgeon recommends moving lower jaw back, the other recommends lower jaw back/upper forward/chin/cheek implants) -Would like to know if silicone cheek implants should be inserted at Surgeon's recommendation, or if not necessary (or going to cause complications as stated in other reviews)