Fantastic, I use it for tracking and does very clean through to grunge and is great for imparting analogue character from subtle to thick. Very versatile numerous options for side chain and chain.
The knees are great 2:1 is slow and gentle, great for invisible compressing. 6:1 is good at grabbing the transient without crushing which 20:1 and nuke do well. The opto 10:1 is different circuit topography and is great for smoother ala La 3/4 compression.
There is a reason this item is called a modern classic.