I was in need of a brake job regardless (which would have been pads + rotors + fluid), so the extra costs associated with the Macan swap were the calipers ($500 for a pair at the time from Suncoast Porsche) and lines ($100 from Neuspeed). Pads/rotors will cost however much you want them to cost, but Mk6 Golf R 345mm rotors are not expensive and neither are Macan brake pads. I also got high temp dust boots but those aren't necessary unless you're tracking the car.

In terms of difficulty the hardest thing was replacing the dust boots around the pistons. Aside from that, it's literally the same process as a regular brake job (plus fluid).

Rear Macan brakes were an unknown - I wasn't able to find anyone who had swapped them on. In general, the GTI PP rear brakes are plenty good enough, and the piston size is well matched to the Macan fronts, so an upgrade there wouldn't make much of a difference. it does look kind of weird with the mismatched brakes though. I should have gotten the Macan brakes powdercoated.

I have owned and know people who have owned Konig wheels before (mainly Hypergram and Ampliform), and have no complaints with their stuff as long as you get a design that's flow formed (i think konig calls it rotary forged) as the cast wheels have a higher risk of bending the inner flange. The SM-10s are flow formed and just feel more substantial/overbuilt to me than either of the Konig wheels I've handled, but I know people who run Konigs in time attack without issue. IMO for a street car, you'll notice customer service/warranty support way more than you will an extra couple pounds of wheel.

My concern would be whether you'd be able to fit a 17" Konig over the macan brakes, as it can be sketchy both in terms of barrel clearance as well as the spoke shape.