The Callaway Tour i(s) Golf Balls are a short-game weapon with maximum control and a soft feel. It's no secret that the new groove rules instituted by the USGA are designed to reduce spin off wedges and short irons, placing more of a premium on shot-making.
xarkzila917 - 9/15/11 I went for a complete fitting and these balls were #2 on the list. (The "iz" was #1.) I've been playing them for the past year and finally tried an "iz" today. If 5 yards is more important than having a lot of control around the green, then get the "iz." However, the "iz" showed pretty good control on the greens as well. They were just sanded and I spun one back about 3 feet off the front of the green. The "iz" releases farther then the "is" however, so I'm still all about this ball.
jalloret - 8/8/11 An excellent golf ball. The Tour i(s) is engineered for tour-level spin around the greens, and not distance off the tee; that is exactly why I use them. I am less concerned with distance than I am with control and feel around the green. If your concern is distance, this is not the ball for you. Allowing tour-level spin almost always equates to a very soft urethane cover, and this ball is no different. Unfortunately, having such a soft cover results in the ball being somewhat easy to scuff. This is a premium ball, and if another concern is price, again, this is not the ball for you.
saunderscc - 4/11/10 These are great balls. Pretty good distance but very good spin around the green. Cover is somewhat easy to scuff. At +/- $45/dozen they're not exactly a bargain. Compared to the other premium balls, Pro V1 line or Penta, these are similar from my experience and choice becomes a personal preference.