I've heard some horror stories about drilled rotors. Namely that the edges where they've been drilled are prone to cracking when they get hot.
When you drill a hole in metal the hole becomes a stress concentration. The act of drilling the hole can also cause micro cracking, which in time can propagate from the hole across the disc, as shown in the earlier photo. The expensive ones are cast which avoids the introduction of micro cracks from the drilling process, but these cost a lot more to produce.
In terms of brake set ups, I've had standard discs and pads for pug, standard discs with green stuff pads and vented brembo discs with Mintex M1144 pads. I've also borrowed a 6 with the exact set up you are looking at.
I thought standard pug set up was pretty good, the greenstuff pads had less initial bite but didn't fade as easily and the brembo/mintex combo I'm running now is by far the best of all I've tried.
I didn't get on at all well with the drill/groved discs and greenstuff pads. First time I came to a roundabout I braked as I nornally would and thought I was going to go staight across it
Chris - Phase 3 Moonstone GTi 6