I Have An 09 R57 S Converitble With Automatic. The Throttle Is Slow To React Off The Line, Creating A Hesitation. This Occurs Again When Slowing Down, Foot Off Pedal And Then Wanting To Speed Up. Is It Me, The Car, Or My Imagination?

 

Take it to your dealer...it's under warranty ?

 

Could be the fly by wire hesitation that's inherent of these cars. activate the sport button and see if it goes away.

 

^^^ what Raven and 10Zero said. That doesn't sound normal at all. Does it act that way with the sport button both on and off?

 

My Clubman (justa) auto does that. I haven't noticed so much 'off the line', but it there is a scary hesitation when like passing a slow truck.
In those situations I put it in sport mode (DS) via the shift lever and the hesitation goes away. I go back to normal (D) after the passing or whatever as the sport mode forever holds the tranny in 5th with RPM's high.

Also give manual shifting a try...