Saline implants are very rarely used in this country anymore. This is because they are more prone to rupture, they feel less natural and they need to be changed every ten years. MYA use cohesive silicone gel implants that are made by Allergan - the biggest manufacturer of implants in the world. They are hand made and of an extremely high quality. The gel inside them feels very natural but has a 'jelly baby' consistency which would prevent it from leaking. Your patient coordinator will be able to give you more information at your free consultation.
In regards to the stiches, most surgeons use dissolvable sutures but be sure to ask the question at your consultation.