Air brakes (provided they are with in spec) are incredibly powerful. When you first drive it, keep in mind there will be a slight delay before you feel the brakes. It is a little alarming the first few times you start pushing the brake pedal and nothing happens for a half second.
All the functions are virtually identical to any other automatic vehicle you've ever driven. Just on a larger scale. Gas is on the right, brake is on the left.
Have fun.... post some pictures if you pick it up.
ps. that transmission is sweet.
I have the 643 and I'm always wishing I had 1 more gear.