I had mine drilled by a co-worker on a CNC horiz. mill, then I personally chamfered and rounded the edges as per a racers advice.
The racer I know(Tom Watanabe) said that un-chanfered holes will give you more "grab" than un-chamfered, it will also wear your pads out prematurely.
He also said the only rotors he has had a catastrophic failure with were the un-chamfered.
The 2 rotors fail in 10+ years of racing.(gone through countless bikes, all came drilled, or he had them done professionally... he's got a sponsor for his racing $$.)
One resulting in a SERIOUS crash(100+mph, lost a front rotor) and the other time in a corner at under 60mph.
He swears the cracks both times came from the unchanfered holes.
Now he makes sure all have a nice radius to the holes.(does this himself though)
Don't really know if they get less"grab" than un-chamfered holes....
But can it hurt to be cautious?
I even ran a flapper type hone to round them out even more, to remove ALL sharp edges, the way he does.
It's your face vs the asphalt... which one will win?
Nice looking rotor pattern there!
l8r