I can see you're excited. You already have the At Pro listed in your profile.

Oh yea, you're either gonna go out and greet the UPS guy or your gonna jump up and peek out the window every time you hear a truck go down your road!

I haven't touched my 350 since I got my AT Pro.
It's pretty similar. Watch all the Garrett videos before you get it. Then you know how to work it when it arrives and can take it out and play with it. Ask me how I know.
Here's the link to the Garrett videos and the owners manual:
Manual:
http://www.garrett.com/hobbysite/hbby-manuals/1533200_atpro_english.pdf
Garrett Videos:
Garrett AT PRO Training, "From the Field" and Tip Videos
Congrats, you're gonna love it!