I just purchased and received this capo, and have also ordered the G7 capo. Why? When perusing the internet acoustic guitar forums, including Martin guitars, there were several posts by very experienced members reporting damage to the neck of their instruments due to the tight squeeze of the Kyser capo. Some of the posters recommended 'breaking in' the Kyser by using your hand grip to attenuate the spring tension. I am leery of doing anything that may indent or scratch my beautiful Martin D28, so I ordered the G7 that had received accolades from the various forums' members. Do your own research in addition to the Ama*on's reviews.