Yes, yes it is.

Superfly - Still getting the hang of this, but it is definitely the future

Autosave - need I say more?

Control Handles - very useful in creating life-like expressions (or someone getting punched in the mouth, which could be viewed as an expression.....)

The Game Dev features were also added - I love feature combining & polygon reduction (Combine figures & clothing, do 10% poly reduction and viola! I can fill every seat (13) on my Star Trek TOS bridge set).

The ability to make INJs within Poser is also useful (and hopefully they will add the ability to make a REM file in the next Service Pack).

It's also a bit faster in reading the libraries if you have large ones (I do.).