A7 has a very simple scripting system that enables you to write complex 2D and 3D applications very quickly. I am only 15 years old and have found A7 to be rather simple to work with, despite the fact that I am working with complicated systems (3d graphics, vector math, networks). Don't let those words scare you, it is much easier to work with than a *normal* development system like the Microsoft Visual products.
Essentially, A7 is a rapid prototyping engine that lets you get good results fast, like Delphi.
Now, the including tools (WED, MED, SED) aren't perfect and some say they leave something to be desired, but you can download the trial version to try them if you're not sure. If you don't like the included tools, A7 lets you use external tools (Blender, 3DS Max, Maya, 3D World Creator, etc.) to create your game/application assets, and you can use your favorite text editor to create code.
If you don't have the time to download and experiment with a trial version, you can view some shots from the
Gallery at the 3D Gamestudio homepage.