Thanks - no PDC on the car - I've heard mixed reviews, especially from people that have hit curbs and small posts with it.
The only way I could justify spending that kind of money on wheels and tires (just under $4,500 for the set) was that they will fit the E60 M5. I'll probably substitute all-season Pirelli Pzero M+S for the OEM runflat tires mounted on the OEM wheels for driving this winter. When I get the M5 (I'm first on the list, but it will be at least another year), I'll trade-in or sell the 545 with the OEM wheels and tires, and put the RS-GT's on the M5. One additional benefit of the wheels and tires is that they weigh a total of 56 lbs LESS than the OEM's, even though the wheels are 1" larger. The car feels quicker, handles better, and rides much better.
I've never gotten so many compliments on a car, and I think the wheels are a big part. Now that I have them, It would have been worth it M5 or not.