Depends on your use of the car, doesn't it?
I use my Cayman exclusively on the street. I replaced all my pads with ceramic pads about 500 miles ago. The reduction in brake dust is unbelievable and my wheels now look good and with cleanliness equivalent to a normal car. Nice to see beautiful silver wheels and colored badges in the center instead of the usual uniform gray-black coating of dust. For four years and 16,000 miles I put up with that crappy dust that made my wheels look like they needed a wash after one turn around the block. No more. These pads are silent, they cost the same as OEM pads, and if there is any difference in stopping power, I can't tell it. Yeah, and now I cut my hand about 1/4 as often due to not having to wash all the time.

ok, do NOT ever buy Autozone semi-metallic pads. They squeal like a stuck pig :) I bought Brembos from the local Porsche (Autonation) and also got my money back from Autozone. The Autozone rotors are good, but the pad composite material sucks with a capital SUCK! :) I didn't realize Porsche sold Brembo. Oh well, they work great and don't sqeal. Oh well, simple lessons learned :)