Lots of folks over on KVR have likened it to Decapitator and said it was less extreme but more pleasant overall. I haven't heard any comparisons to Saturn yet, though.
I'm real dubious when it comes to saturators. They're just not that useful to me. Most of them just dull a mix when used gently, and when pushed hard can suck the life out of it. I
like my transients and dynamics, thank you very much.
However, I do love the harmonic exciter in Ozone 4 (not the one in O5), which also does tube and tape saturation, and would love to find something as good that's light enough to use on individual tracks. Maybe this is it?