It’s actually really quite good as a SS full sus because it stiffens when standing to gurn so it doesn’t bob around. It’s more like a soft tail than a proper full sus though – it takes the edge off bumps rather than being plush despite actually having about 7″ travel.
When seated, it feels pretty normal – I can’t say that I’ve ever noticed it feel like the BB is moving a lot with one particular exception – if accelerating out of a tight corner while seated, you feel the back whole bike kind of tuck up and it feels like your effort’s going nowhere.
Oh and it can be scary on steep drops if you run with any signifiance sag as the saddle suddenly rises just as you go over the edge! I run with little sag 🙂