Ciao Claudio...come stai?
I think once you overcome the Polygonal thinking in Max, you will wonder why you didn't get started earlier with AM.
The reason I say this is that AM is very fast when you want to put together a quick animation or small video clip. All the tools are there for your animation needs and the workflow is seemless because it is all incorporated into one package. You don't need to purchase an extra plugin or import from other software...it's all there for you.
Basically for the independant artist, AM beats all other major 3D software, hands down.
One word of caution and that is that if you are looking to use your Max models in AM, it just doesn't work that well.
Cheers,
Eugene