I'm in my last two days with a 20 day demo. I think it's great. You must use it carefully so you do not get any artificts. If I notch out a lot, much else would be lost, with Sooth2 it retains its source gallantly without harshness. It was a little too good not to press the buy button.
But agree with Martin John Butler that it was in the most expensive level. But smart and good plugs deserve it, as well as good hardware. Was quickly addicted to it ..... or rather I AM addicted to it! The modern variants say "Sex, Smart Software and Rock'n'Roll"
I was a very early adopter of Soothe and have always loved it, but as I've improved at recording over the years, I've honestly found Spiff to be a slightly more invaluable tool.
If you're obsessively nitpicky about transient control like I am, Spiff is crazy good. Although the new FirComp (with 0ms attack and FIR lookahead enabled) is also worth a serious consideration for this purpose... and it's free.