How is it - Its easy to drive and shifts quickly probably faster than a person could do it with a manual.
Difference between a normal Auto and the Supra Auto - This autobox will kick down quickly and rev to redline when you push the loud pedal. It changes very fast and there is no lurching betweens gear changes due to the engine reducing the torque for a brief moment when it changes gear. The autobox will also be good for up to 550bhp as long as you have fluid coolers. As you know the box also has a manual mode where you can control gears 1 - 3 which is fun if you miss the manual experiance, i dont think the box changes any quicker in manual mode but its there if you want to use it, i find i keep mine in Fully auto until there are some twisty country roads where the manual mode is great fun.
http://www.mkivsupra.net/vbb/showthread.php?86128-The-Autobox-Modes-of-Operation