Just want to share my experience. I thought this would be useful for some.
My Fizik Cyrano carbon seatpost had a deformation due to seat clamp. I think there was a calibration issue with my Ritchey 5nm torque key. This torque has destroyed 2 seatposts in total. I thought the first damage was due to my fault. But now it was confirmed by this latest issue. Anyway, I filed a warranty claim last week, hoping that some guy in their Italian office would answer. I received a response on the 2nd day. She apologized for what happened and asked me what size the seatpost was. No other questions asked. The next day, I got an email of an express airmail shipping confirmation from their warehouse in Italy. WOW! And today I got it. Extremely pleased with their service (Fizik or SelleRoyal).