I'm still using them. However, at the recent Nordics I had to switch to the normal ball diffs because of a very unusual tracl surface. Astroturf with long hair, high bite and bumpy. A surface that was terrible to drive on and the only place where I've felt the normal diffs outperformed the geardiffs.
The remaining rounds in our national championship is regular carpet where I'll be using the geardiffs again.
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