Nobody's really speaking up, but when I was researching my rotors I found a few threads where this was mentioned. I chose SP Performance's "diamond slotted" design because the holes' edges are tapered, which should be less prone to having little rocks get stuck.
FWIW I'm pretty sure this is the exact rotor that Tone was using for Rally racing - he was one of those who spoke very highly about them when I was asking around.
I don't have them installed yet, so I can't give you much of a first hand review. 
Calmini Cone Air Filter, PowerVault PV2 Muffler, OME Trooper Springs, Rancho RS9000X Shocks, 285/75R16 Nitto Grappler AT's, Pioneer DEH P8000R In-Dash CD, Amps and Drivers Built by Orion, Wires and Fuse Blocks by KnuKonceptz, Vibration Damping by BQuiet, Alarm System featuring Auto Start and Remote Windows, Yakima LoadWarrior w/Full Size Spare, Debadged/Custom Titanium Grill Logo, Tint (5% Rear / 20% Front), Steel Braided Brake Lines, G2 Painted Calipers
Originally Posted by r1concepts
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