I have Suncoast 7mm front and 15mm rear's on our Cayman GTS, with PASM + (20mm lower than standard) - no rubbing issues and looks great and fills out the guards well. The rear is just in line with the body work and the front just inside the body work.
Ive only taken it for a quick 25km or so blast through some twisty and average roads with sport suspension enagaged and not engaged there was no rubbing issues or driving changes. Turn in was great. While only a short drive, the slight amount of understeer that i'd picked up on a couple of occasions when entering a corner too quickly, seemed not to be there - but I need to do some more km's to fully understand.
Will update over time.