Reliability and precise shifting is what we have come to expect from SRAM twist shifters. The XO shifters have a loyal following and are attractive to riders that want an alternative to trigger shifters for a high-end bike.
There are plenty of riders on our staff riding Twist Shifters and we have noticed a phenomenon - most folks that do not like this style of shifter have never actually used it. Thanks to a lot of engineering from SRAM, they work great and the shifting is incredibly precise. They are definetly worth a try.
Installed on my Bike Friday NWT. Shifters are working with an X0 rear mech (9 spd cassette) and an Ultegra front (triple). The shifters installed just like any other Grip Shift and are still shifting reliably after 10K kms. No issues at all - would buy again.