Once you get some miles on it I strongly suggest getting the Power Commander v and the K&N air filter and an aftermarket free flowing muffler. Once you remap the ECU the bike will be a lot more responsive and should idle much better and start much better as well.
Just a word of advice since your GT is brand new, follow the book when it talks about how to break in the motor and what speeds you should stay under. Don't lug the motor. Keep the RPM's up around 3000 and shift around 3000 to 3500. Try to avoid writing below 2500 rpms as this will cause the motor to lug. And like everyone else says, the more miles you put on it the happier the bike gets! The NGK spark plug that was mentioned in the other post, I suggest swapping that one out for the one that came with the bike. I did this over the weekend and the bike seems to be happier and the idle seem to be smoother. But most of all follow the book on the break in process and don't lug the motor or put a lot of load on the motor. And even more, have fun!