A couple years ago I took a low-light shooting class with Mike Pannone. He stated at the beginning of the course that the low-light material he would be teaching was based on his experience teaching Federal Air Martials and focused on ingraining the simplest and easiest to use techniques that were able to be employed with virtually any hand-held flashlight. We basically spent two days honing and getting lots of reps in the use of Harries and a modified “neck index”. Neither of those techniques benefited from the Thyrm Switchback I had installed on my P2X Fury, and it complicated/interfered somewhat with the reload processes being taught, so I ended up removing it for the rest of the class. Funny story: I put it back on the flashlight after the class, simply because it enabled me to have the light clipped to my pocket. Not too long after I went to Disneyland and was not allowed entry to the park. Security indicated that the light/ring could be used as a “fist-pack and knuckle” weapon. I removed it, threw it in the car, and have not put it back on since. I’ve become accustomed to using those techniques and I haven’t felt for a moment that not having a ring was any sort of loss. I’ve also been able to upgrade/change lights to suite my carry without having to immediately seek out a suitable new ring or figure out how to mod one to fit each and every light I might carry or have on hand.
If you believe that a light ring would benefit you, taking a class that includes material that addresses employing one, such as a class taught by Aaron Cowan of Sage Dynamics, who IIRC helped to develop the Switchback, would be worthwhile. Still, the KISS principals that were highlighted in the Pannone class, such as evaluating the simplicity or complexity of a technique and the ability to effectively use any flashlight not just one equipped with a singular-purpose accessory, are worth considering.