PDK is awesome for performance. Not to start a trannie debate (no, please, no!
), but if it is lap times and 1/4 mile times you're looking for, any porsche buyer has to be compelled by PDK.
I drove a new PDK and PASM equipped 997S a few months back and I was seriously impressed. As Alan said about the Cayman PDK, same with the 997 PDK... It would be so easy to track that car stock, you could almost lease one, slap on some sticky tires and return it 3 years later with Porsche none the wiser... not that I'm recommending that or anything!