A really interesting read, thanks OP and others who've contributed.
Can't wait to pick mine up tomorrow. I've never owned any of the previous Z incarnations, but a lot about the actual driving experience from the testdrive shone through in the posts.
I spent 5days mulling over whether the 2.5i was the right powerplant for me, but when I thought back to the testdrive, although it is a bit lacklustre in terms of torque lower down the rpm range, the way it picks up its skirt above 4.5k rpm reminded me a little of my S2000 I had way back.

Add to that the lovely sound of the straight six and it was a winner. I think the fact that you have to work the engine a bit more makes it even more rewarding.
For me the Zed was the winner vs. a Boxster / Cayman. Just couldn't get my head around spending another 4-5k for something which would've been a good 3-4yrs older, less impressive inside, with less necessary toys and more running costs. One day I'll get myself a Porsche, but when I'm able to fish in the deeper pond of quality machines. In the meantime, I'm hoping that the Zed will tick the box for a long time to come.