Early roll means less deflection and a straighter line.

By gripping the back of the ball and lifting it forward on impact, the C-Grooves of a Yes putter create almost instant stabilization, causing the ball to roll forward much sooner than any other putter. In fact, as much as six times sooner.
The above illustration is a detailed summary of multiple 50′ test putts as conducted by an independent testing firm. Using a putting robot and a 100-frame-per-second video camera, they were able to show how the C-Groove putter dramatically and consistently outperforms the putters of major golf companies.
Balls struck with the Yes! C-Grooves invariably achieved forward roll within 3” to 4” while balls struck by competitive putters repeatedly skidded, skipped and spun before settling into forward roll in approximately 18 inches.
And the sooner a ball achieves smooth forward roll, the better the line it will have and the less likely it is to be affected by aberrations in the green. In short, more putts will drop in.
Even when struck up to a quarter of an inch off center, the C-Groove putter rolls the ball sooner and more consistently.
This technology has been proven in thousands of comparison tests performed by professional and amateur golfers at over 100 PGA Tour Events worldwide and at major trade shows in the U.S. and Europe. Read PGA Event Headlines.
Perhaps the best endorsement is the fact that over 200 touring pros now use Yes! putters, without receiving any endorsement dollars to do so. They use it because of how well it plays, not how well it pays.
Additional Testing
Independent Testing: ‘Robot’ testing was also conducted to compare consistency of distance and line for balls struck with identical force numerous times on a 50′ putt. These tests substantiated the fact that the C-Groove putter, due to its truer roll, was more consistent in distance and line. By hitting the ball on different points on each putter face, the same test also proved that the C-Groove putter had the least variance in direction, even on off-centered hits.
#1 Rankmark Ranking: In 2002 The Yes! Golf C-Groove putter has been ranked number 1 among 60 of golf’s top putters, by Rankmark, America’s premier golf testing company. Rankmark conducted independent testing at country clubs, driving ranges and PGA and LPGA Tour events.
100% Satisfaction Among PGA Tour Partners Members: Soon after introduction, Yes! Golf C-Groove putters earned an unprecedented 100% favorable review with a buy rating from PGA Tour Partners Club members. The PGA Tour Partners Club is an organization of 500,000+ golfers and regularly sends new golf products to members for unbiased review and testing. Members use the product, then complete detailed product test reports.