Opinions on Silhouette Lift?

This is an excellent question.
The Instalift is an excellent procedure to re-contour the face, lifting deeper layers of the skin for a more youthful appearance.  You see immediate results and there is no downtime.
The Silhouette InstaLift uses a esorbable suspension suture with bi-directional cones. The sutures lift and reposition tissue while the bi-directional cones hold the suture and facial skin in an elevated position. 
Over time the sutures are naturally absorbed by your body while stimulating production of collagen to aid healthy renewal of your skin to produce natural-looking long lasting results.

Thread lifting has a long history with both very beautiful results and happy patients mixed with poor results and dissatisfaction. Most of the latter stems from the use of permanent sutures and poor technique.
Most modern thread lifting utilizes absorbable sutures, which have many major benefits. These threads not only lift and support, but provide volume as they go away, creating a lift and fill effect. The risk of dimpling, an issue with the old thread lifts, is zero here as these are not providing a permanent pull. 
These modern thread lifts are best thought of like a filler. They will do their job for a year or two and then will need to be touched up, but the results in the meantime are beautiful.
Choosing your physician wisely here is key, as knowledge of normal facelift anatomy, tissue movement and technique is a highly valuable skill when placing these absorbable lifting threads.
To ensure you are receiving the highest level of care, seek out a modernly trained, new-school dermatologic surgeon, oculoplastic surgeon, facial plastic surgeon or plastic surgeon who is board certified and fellowship trained in one of these "core four" cosmetic specialties. Membership in organizations like the American Academy of Facial Plastic and Reconstructive Surgery help to identify a highly trained surgeon.
Cameron Chesnut#realself500 Physician

Silhouette Instalift is ideal for a non-invasive facelift which lifts the cheeks and smooths the jawline.  The neck will also show an improvement but not to the same degree as a surgical facelift.  The Silhouette Instalift is an absorbable thread with attached micro-cones that lift moderately lax skin. The thread and cones stimulate your own collagen as they are absorbed.  Similar Silhouette Instalift threads have been used in Europe for years with minimal complications.  Within a few days of the Sillhouette Instalift procedure the improved contour is evident.  Often, the Silhouette Instalift is coupled with facial fillers, such as Radiesse and Voluma, to add volume and shape to the mid-cheek.  The combination produces a very natural facial rejuvenation. Patients are very pleased with a smoother jaw and up-lifted lower face.  It is truly an Instalift with facial rejuvenation that you see within days. The Silhouette Instalift is best for individuals with moderate facial laxity or for those who are not quite ready for a surgical facelift.  Some of the benefits are almost immediate rejuvenation, minimal downtime or complications.  Within 48 hours most patients see a dramatic contour improvement.  It has revolutionized facial contouring.