I had a go with a Yes putter that has the Harold Swash C Groove design on the putter face. They do "seem" to roll the ball better but I am not taken with the look of the Yes putter designs. I understand Taylor Made is putting C Grooves on their new range of putters. My source for Tour Issue equipment had one but would not sell it to me as he said if it ever made it's way to Ebay that would be the end of any business with his contact. vj, Geof, others . Is there evidence that the C Grooves really help? I am thinking of getting my foster brother who is a metal worker C Grooving my Scotty Cameron but want to know that it is worth it.