February 5, 2014
Used these the last couple of years - they last forever. The only time they break is in the dog days of summer - tee boxes get a bit baked and hard. Don't know if there is any gain from the Zero Friction design, but one package is good for the season.
Cons:sometimes one of the tips is worn - you don't see it but you start having a hard time getting the ball to sit on it.