Aaron Martin wrote a review of ESI Grips Chunky Mountain Bike Grip on May 7, 2014
Familiarity: I've put it through the wringer
Once you try ESI grips you're hooked. Sure lock-ons are durable and easy to remove but those grips give up all the energy absorbing thickness to make room for the lock-ons plastic core. These have the perfect energy damping property. I tried another foam style grip from a competitor and they did not have the same high speed and low speed absorbing like the ESI grips do. And as an extra bonus, they're light.