Well I think you've definately not sold the Cayman to me. I could counter most of the points, but we'd be here forever. But from what I can see I'm very happy I didnt sink my money into a Cayman
The wheels do look plain stupid though, the car sits so high on them!
Main points to note for me - sounds like the brakes, seats, engine and handling are all worse than a 370z in that spec. Satnav, although sounds flashy, the Zed does all that too with Connect Premium, plus it now comes with a reversing camera. Interior, although better made in the Cayman, I just thought it was seriously boring
I suspect it would be a different story with the Cayman S, but thats another league away in terms of price again.