I recently (2 months ago) had Stabilink installed between L4-L5, to replace a Vertiflex Superion which became dislodged after 2 1/2 years pain free.
During the new procedure the Vertiflex was removed and new device installed. I am now relatively pain free and working on getting strength back. Spinal stenosis symptoms are reduced about 80-90%.
I figured if it didn't work these devices do not preclude any more invasive treatment if needed in the future. I am happy with the results.