It most certainly is a very viable solution for a weak or receded chin. Chin Implants, IMO, should be anatomical in design so they augment not only the front but taper along the sides. The Chin Implants that are isolated to just the front, of the chin, make it look elongated and un-natural.
I have been using Chin Implants for Chin Augmentation for almost 25 years. I'm sure the costs vary depending on the experience and reputaion of the plastic and cosmetic surgeon doing the Chin Augmentation. In our Beverly Hills/Los Angeles office, our surgical fee starts at around $5,500 with an additional OR and Anesthesia fee. While Chin Implants can be removed under local, their placement is best done under general anesthesia as the Chin Implant should be placed under the covering of the bone. I have not found it necessary to sew or screw Chin Implants in place but do do the following in all Chin Augmentations with Chin Impants:
Use Silastic Chin Implants which can be removed anytime. Why? Because forever is a long time and you want to have the option of removing the Chin Implant anytime you want.
Place the Chin Implant through an incision under the chin. This maintains the natural muscle attachment to the chin bone avoiding ptosis (wich's chin) from developing in the future
Under the chin is sterile, while placeent through the mouth is not. This approach also maintains a barrier preventing the Chin Implant from riding up into the sulcus, or groove just below the lower gums. Extrusion of the Chin Implant causing possible infection and definite Chin Implant removal can occur if the Chin Implant moves into this sulcus when placed through the inside of the mouth.
Place steri strips on the outside of the chin for 5 days.
Require all Chin Implant patients to sleep on a U-shaped airline pillow for 1 month after the procedure.
You may want to read an article I've written "How to choose your plastic and cosmetic surgeon" that you can use when searching for your Chin Implant surgeon. You may also want to read my new book on the aesthetics of beauty, including the chin "What's Your Number...the palmer code."
Chin advancement, often called sliding geneoplasty, requires actual cuts into the mandile to slide the chin bone cap forward. I have always felt this approach as extremely aggressive since the alternative of using a silastic Chin Implant over the bone is available and far less invasive. If you look at my book, you will notice that the face on profile is more than just chin projection. You may wish to consider nasal reduction at the same time to further balance the face...IMHO.