Koni's strut incert (front) lasted on our cars (Audi's) about 10 - 15 miles (yes that is correct) the Bilstiens have lasted 1 season worth of racing and no issues have even started to be a concern, at this point they look like they will last forever!!!

Raymond
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Sounds pretty similar to my experiences Koni vs Bilstein... I ran my Bilsteins for maybe 5-6 years before even touching 'em, and that only to revalve. Probably shoulda had 'em rebuilt after 3-4 years, though...

PS - note that after that 6 years, I ran within tenths of the lap record...