I replaced good condition 7/8" Renthals because I wanted a taller bend. Bars felt great and looked even better. I ended up landing on a squid in practice, and went tumbling down the landing. My bars took a severe beating, but the twinwall never bent! Even the crossbar bent down to the clamp and the crossbar mount ending up snapping, but the twinwalls themselves never budged.
Absolutely amazing how strong these bars are!!! I just wish they sold the crossbars and crossbar mounts separately, but I'm not complaining.