From what I've heard, the original Agent and Special were the best of the bunch, and were very versatile (able to be used on most any condition with surface adjustments). The original Agent is the most skid/flippy of the series by far, as it clears the fronts easily and delivers a sharp backend reaction. I've had two Special Agents, and they were both smooth reacting, whether dull, polished, or in between. I kept both of the Specials at 2000 or 4000 grit, and they are great benchmark balls for most any condition.
I have the Secret, and to me that is one of the most underrated bowling balls I think out there. It is a bit condition specific, but if you need something which will just flat out arc and not make a sharp move off the back of the pattern, then this is the ball you want. It is perfect for shorter pba/sport patterns where you need to play outside and need control at the breakpoint.
I really have not seen the Double Agent in action much.
Hope this helps.
Edited on 4/13/2009 1:23 PM
