I know that there will be "purists" that will disagree with me on this.. so be it. But frankly with the small ridges and groves (as long as they are not excessive and as long as the pads aren't worn down to where the metal pad back isn't coming in contact with the metal rotor.) I'd just leave them alone. First off, why spend the money? Second off, you'll get better braking from them than with smooth pads and rotors because you now have more surface area than with a smooth set. The greater the surface area, the more friction. The more friction, the more braking. You have to think 3 dimensional on this one. Each one of those ridges and groves equals more overall surface area. If you feel better about replacing them, by all means do so. But if it were me I'd leave them alone.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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