Installing Urethane Cushion Buffer Pros and Cons

1. Improve your riding experience. It enables smooth steering and controlling of your automobile and provides stable driving (Marketing Hype)
2. Reduce a leaning phenomenon on a sharp curve (True - limits spring compression travel)
3. Height restoration of your automobile (True - removes sag from the springs)
4. Reduce vibration of your automobile on the rough road. (Not so sure about that claim- could be true if you are constantly bottoming out the suspension)
5. Shorten braking distance (Perhaps - limiting front dive under braking keeping rear tire more in contact with the road.)
6. Protect shock absorber (Perhaps - limits full compression of the shock shaft onto the shock jounce bushing)

I have not installed or tested these products.
If my Prius had a suspension issue related to springs this could be a cheap fix.
FWIW I recall NASCAR used or uses a similar product/ technique to adjust ride height....inserts between coil springs.

Good luck with your purchase decision.

 

Spring inserts have been around a long time. This type is definitely unique. The type I used in the past did limit spring compression. But, truly, it was not as good as just going and getting shorter springs, shocks and aligning the car.