I recently purchased the Cobra F9 Driver and two fairway metals. Hit the clubs mostly indoor with range balls February and March. Loved the performance. When the weather broke in the midwest and I started to get out to play, Immediately noticed a problem with my balls. The thin channel that runs around the milled face on these clubs was shredding balls on contact. I have played golf for over 40 years, and neither myself or my golf buddies have seen anything like it. I have since tested various brand balls with different cover material, all with the same results. I have taken this up with Cobra