The combination stones are good...I use a 1000/6000 stone which I sawed a smaller size off for a compact field stone for my scandi grind knives and Golok....keep it in a plastic tea caddy box so you can easily soak it....works well....but the ultra fine grits I have not used....6000 seems to put an edge on them well enough....and there is still enough of the stone left for a bench stone as well.

They are soft though for re-profiling....diamond stones work much better and quicker at this.