I had RK surgery in 1982 that corrected my vision, but left my corneas badly scarred. So, recently, after lens replacement surgery, my "best possible" corrected vision was still bad. The scleral lenses made the final tweak to my vision and corrected my severe astigmatism.
After days of trying (and failing) 20+ times to use the DMV Scleral Cup, I gave up. On Christmas day, I decided I wanted to see my grandson. I tried the ring applicator. This has turned out to be the easiest way to insert the lenses. It took a while to master, but it was much easier to control the placement. It was actually similar to the feel of inserting my hard lenses on my fingertip 45 years ago. It still takes a few times to get the lens in, but the frustration is gone. I recommend it.