This is an unusual one.  Downloaded the demo and it's working fine on my system, but MAN, what a CPU hog! I definitely won't be using this in a mixing situation -- maybe for (pseudo-)mastering. 
 
As for the sound, initial impressions are good -- very nice vari-mu type gluing effect on a full mix.  However, beware of big rolloffs at the frequency extremes, particularly down low.  If you don't want to lose your bass, try the limiter mode instead of compressor mode.  Both modes roll off highs above 15K or so.  May or may not work in any given situation, but worth a try, nevertheless. 
 
Cheers,
Eddie
 
 
 

@Eddie

I haven't tried this demo but have Alex B's GMD. 
Do you know how they compare?

I can't install anything new until I do a major backup & am waiting for a reg. number in the meantime.

IIRC Alex B's GMD (German Mastering Dynamics) is  based on a Neumann U473 comp/limiter.  I take it they're different models?
 
I never used the HW of either so I wouldn't know the difference anyway!