How Will a Chin Implant Feel?

A chin implant should be quite stable once it heals in its pocket. You can see how this pocket is made in the video link I put in my answer to your other question about chin augmentation. As the body heals in around the implant it keeps it in place and it would be quite difficult to shift it even with trauma.

You shouldn't be able to move it around. It's covered by quite a bit of muscle and soft tissue and the silicone implant is solid so it should feel more like bone rather than soft tissue.

My web reference link below discusses the various aspects of chin augmentation.

    The chin implant is placed directly onto the bone and feels like an extension of the bone.  The soft tissue is dedraped over the implant.  Pocket dissection needs to be done precisely so that the implant has little chance of moving either early after surgery, years after surgery, or after trauma.  Kenneth Hughes, MD Los Angeles, CA

Silastic chin implants feel very natural to the touch. If they are placed properly they will not be mobile or move under your fingertips. The greatest concern is proper choice of the implant which will provide a natural contour that will be in balance with the rest of your facial features. This requires experience. The bottom line is that a well performed cheek implant procedure should create a very natural look and fell. I hope this information is helpful.Stephen Weber MD, FACSWeber Facial Plastic Surgery