I run the normal folding version front and rear on my hardtail – not the black chilli version.
I find them good. Predictable good grip in the dry and they have been good in the wet also. They are no where near as grippy as the mountain kings but for XC riding they offer very good balance of speed and grip for all but the driest or wettest conditions.
I also use them as my intermediate mud tyre for CX racing for which they work very well.
Grip is personal though. These days most of my offroad riding is CX and XC so a bit of predictable sliding is fine if the tyres are generally fast. Might not suit if you are used to 2.4″ tyres and huge amounts of grip.