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Well, the only thing I have done so far is refresh a blade that has lost it's sharpness. Around 50-75 X-strokes with clear water brings it back then I strop on pasted balsa and leather and it is...

I used wet/dry sandpaper 650 and 1000 grit to flatten mine. Worked great! I followed the instructions in the wiki for lapping stones.
Hone Lapping 101 - Straight Razor Place Wiki

I am just learning about my Guangxi stone and I love it but I have nothing to compare it to either. With that said, I have gotten my straight sharp as or sharper than my feather blades in my shavette...