Hi all,
Just wanted to share my exp with stiff rings; I had it installed (Persona E) several months ago. I can say it considerably improved the ride comfort esp over small bump, humps & other road imperfections. Handling wise got lil bit sharper as well.

I know that its just a piece of machined aluminum thus lacking the robustness when compared to the likes of "Rigid Collar", I guess a skill machinist could make one from a stronger material; maybe from a harder grade 7050 Alu alloys / mild steel