Pretty good compressor with fet coloring and saturation stage. I used it as main bus compressor for a few months and can say that this thing is extremely versatile, from hip-hop to acoustic ballads it sounds awesome. Tone shaping function is pretty good thing but to my ears it doesn't work like usual sidechain filter, sometimes it works great, sometimes it makes sound too colored and boomy (for the low freq) so be careful with the knobs and add the level slightly from the zero point. Overall if you want classic "HP SC filter sound" you need to think about external sc. The only one thing that disappointed me is that to my ears it's not the best compressor for the vocal, 1176 plug-in from uad did this job better.