I’m running Rimpacts on the rear of both bikes, using EXO+ casing DHR2’s, front and back.
As a 115kgs monster, i thought it prudent to try them at least.
Ive felt them working on a number of occasions, saving the rims from possible damage. I’m not running very low pressures, 30mm carbon rims at about 25psi F+B.
I have also had a small hole in the sidewall of the tyre (front a flint) and the fact that the Rimpact was in there meant it did not seal with sealant. As i was fairly close to home, i just rode slowly back on the rimpact and tyre alone, as a trail side fix would involve a slime covered foam ring and alot of faff, as they were tricky to get into the tyre in the first place.
So, in all, worth the (small) cost and negligable weight gain to protect my rims, and they def help the tyre to be less squirmy at 25psi.