This is to me by far the best freeware saturation plugin and the creamiest compression you can get inside the box.
The 2 saturation modes work well for hi end material as well as basses, rhodes, etc. The 1 knob compression is as soft as you can think of, making it almost impossible to make the source material sound bad, even at extreme settings.
The GUI is really cool and easy enough to get the thing sounding without reading the manual (a bit big though), but if you want to know all the details you should definitely take a look at the pdf. Its worth the reading as usual with VoS plugins.
If you have a PC you shouldnt miss this or any of the other VoS plugins.