I use my GRS hone on flats if they really need fixing, lot of material removed. Stones and a leather strop get the most use.
Power tools work too fast for 99.9% of chisel/gouge sharpening and don't put on a good enough edge.
Guslers carving video goes into sharpening.
Using anything high speed will just burn the temper from the edge and can only be used for roughing out large tools.
Dan