I've been running trails in minimal shoes for a while and done well. However, more technical trails were wearing on my ankles and my minimal vibram outsoles could not grip quite well enough in these rockier, slicker conditions. The Speedcross 3 CS is the solution for me. Light, stable, and very grippy, I can be much more aggressive over rocky trails, boulders, and down hill sections. My first run in the Speedcross 3 CS was a 15 mile trail run with 2700 ft of elevation gain and loss in sloppy and rocky conditions.  They felt great and and I am ready to ramp them up to my next 50k.