Like I wrote in my recent tyre dilemma for winter, mainly for road but the odd bit of off-road, G-One Speeds are not officially designed for wet off-road (including my 2.35″s). Schwalbe say they are basically a dry summer tyre off tarmac.
I can’t say I’ve experienced this negative, but it’s a concern, making me think I will be fitting my Marathon Crosses this coming weekend. Inflated to ~60/80psi they fly on the road, drop that down to ~50/70psi and they work pretty well off-road too (better than at road pressure, but still very useable at the higher pressure).
G-One Allrounds may perform much better all year round, never tried them.