While a lot of people focus on the traction control function of the Manettino, remember that it actually controls a lot more than that. Suspension settings, transmission, e-diff, etc. It's not just varying the level of traction control intervention, it's changing the attitude and handling of the car all in one convenient location instead of the confusion you get trying to adjust the GTR for instance.
Big cities suck
"Not putting miles on your Ferrari is like not having sex with your girlfriend so she'll be more desirable to her next boyfriend." -Napolis