Bests & Worsts Reviews from Amazon

See other reviews for general information about the head and its performance - other reviewers have done great capturing the pros and cons. As for ONE particular con: this ships with no instructions, and a butterfly spring that, as others pointed out, does NOT install intuitively. See my customer image, where I've done what I hope is a passable job of describing how the spring is installed, after wrestling with the thing for an hour.