The "hard" mount is undersized and will not fit any oversize handlebars - ridiculous and useless. The quick release mount is similar to the Edge quick release, therefore not a true quick release since you would have difficulty mounting this in the dark. The whole unit seems unnecessarily large and bulky, taking a lot of precious handlebar space for a little convenience. The configuration as a large thick disc limits reasonable mounting options as you could not for example place on or near the brake hoods. A small rectangle would be better. I bought two - one works fine, one will not sync and is being returned.