I would give this closer to a 10 if it weren't for the fact that it doesn't work properly in Ableton.
It's remarkable, given the popularity of Ableton, that this company released Stochas without getting to the bottom of the issue.
On their support forum they say "they're looking into it" but that reply was May 2017 and it's now early July.
One of the selling points of Stochas are its 4 layers that can work in parallel to enrichen your sound/melodies etc.
To do this layer 1-4 are routed to MIDI channel 1-4.
On a You tube demo a bloke using Kontakt does this. However Ableton users can't use this functionality. There were 2 other people like me who had written on the Audio vitamin website about this.
The plug in does nearly everything I want for my experimental installation type soundscapes, and I have a workaround for this issue where I just have 4 instances of Stochas each routing to a separate synth/device.
However at $50 this shouldn't have been necessary and the really nice functionality they created for working across layers is lost using my workaround. The functionality is that the notes of other layers are 'shadowed' as you work in parallel layers. It makes it easy to make/see the possible polyrhythmic patters.
So in conclusion. A potentially 'awesome' tool is handicapped. I will come back here and give it a 10 if they fix this issue in an update. But after 2 months since they were "looking into it", I am not convinced that's going to happen.
I love the concept, it looks like a fantastic tool for semi-random pitch variations etc. BUT: it is not 'trigger-able' - it just starts playing blindly as soon as you engage the transport, so it is useless in a live situation. Come to think of it, even for sequencing: who says I want that particular sequence to be the very first thing that happens?
That said, if they add some user control to the triggering, I would buy this in a second.