I hate to agree with , but the stiffness kinda bothers me. What fascinates me is the way his head does that rocking motion when he says "hel-oooooooo" are you playing witht the puppet/armature feature?
Now, I like the animation as it has so much effort put in to it. But unfortunately it suffers from stiffness. By that I mean, the way the arm moves from the side to the front looks a little off. Not only that the way the head looks when he shifts it up just stays the same. I don't know too much about Anime Studio, but it doesn't seem to offer that much than flash does. I dunno.
But I will say that certain parts of the body were really drawn well and the expression change and lip syncing looks great, too. Then again, you have worked in animation before so I would expect that.