I use three pins, mainly because my hunting bow is also my target/practice bow. Green set at 20, Yellow set at 32, Red set at 45. While hunting the colors translate to a traffic signal: Go, Caution, and Stop (and really think about that 45 yard shot flinging through the trees).

All my shots have been under 25 yards, so the Green has been the only sight in my vision if ya' know what I mean...

S&R