The Yes! Golf Callie Putter is extremely popular on all of the major professional golfing tours worldwide because of the technology that gets the ball rolling forward after impact sooner, rather than causing backspin, which they claim most putters do. The design of this putter is very traditional so it appeals to a wide audience of golfers which is always a good thing. I really like the weight of this putter because it is pretty heavy and it feels good in the hands which allows for a good feel. The material isn't that great in my opinion, it feels very metallic and doesn't feel very soft which is something that I look for in a putter. All in all, it is a pretty good putter and I think the technology works but the feel is just not for me.