My experiences with it are similar to most people here, I drove one, and the rest I have seen on track or heard from owners. I expected it to have a bulletproof Toyota drivetrain that we are so used to but as it turn out putting a drivetrain inteneded for a comfortable sedan into a shopping cart screws everything up.
So far I have seen two transmissions replaced, 1 before 1k miles 1 before 3k miles. These are people I saw at the track and obviously they didn't properly break in their cars. I saw one case of as soon as it's started the car shuts off. Never knew what the problem was as I never followed up with the guy.
Other general problems which were a big issue to me on a car that I drove with less then 5k miles on it. Noises coming from everywhere, rattling/squeeking, doors won't lock/unlock (perhaps disconnected wires from shaking), windows won't roll up fully, cracks in floor, sides, suspention noises, the paint chips you normally see on bumpers of 370z are covering entire hood on exige. Even after all these things, I would still seriously consider it for myself though. It turns heads better then Z but once you bag a chick, don't expect to tag her if she's getting a ride somewhere in that thing. Make sure you tag before, that's all I am saying
In good hands though it dances with the supercars on the track.