I've driven my friend's C6 (also has a Borla exhaust on it) a few times. It's a VERY different experience from my car.
Big power, but I missed revving the engine--you never need to get over 2000 RPMs in the Vette really. Hell, the thing will idle up a hill in fourth gear!
Hate the cheap interior and all the squeaks and rattles he's got, and the clutch took a while to get used to (and I'm pretty sure that all clutches are hydraulically-assisted these days--the C6 just has a heavier pressure plate than the Boxster probably, and for good reason). The C6 also feels a lot bigger when you're driving it, even though it's really not a big car at all.
He has a big problem with the gear box though. If he tries to shift into third gear quickly, often times the car ends up in a half-engaged state. It's a common report among C6 owners apparently.
Not the car for me, but I love the way it looks and damn, that's a fast car!
Oh, and I'm not diggin' his headless-dwarf steering wheel:
But GM's already fixed that issue.