Well I must say that I am quite biased cause this is the kind of compression I have always dreamed of. It is smooth, can pump nicely and it is SIMPLE.
I find it works well on all sorts of material, but i like the pump it gave to my drums.
The only negative thing I can say about this is it seems to turn down the high end as you crank it up. In comparison to the IK 670 it sounds good, but lacks in this high end/mid frequency at high compression levels.
This is still a free Comp that i think most would be foolish to pass up. It is just so smooth and simple. :)