Few techniques in nerve surgery have been as controversially discussed as the contralateral C7 transfer (CC7). Since its introduction for brachial plexus surgery by Yu-dong Gu [1], numerous papers have been published on surgical techniques, variations, results, and outcomes—important and in contrast to many other nerve transfers: donor site morbidity has been assessed. There are regional differences in the perception and use of CC7 [2]. Some important plexus surgery groups abandoned the technique [3]. To others the contralateral C7 transfer not only is an important treatment option, but they even expanded its use. It not only can be applied after pure nerve lesions but also serves as an axon donor for free muscle transfers, or as a means to improve function and spasticity after central lesions.