Quick question for the honers

(Disclaimer I've never honed a thing - just reading here)

These Ohishi stones are meant to be good. Has anyone used them?

Also the most popular ones here seem the 4/8k but these stones are offered in 1k / 8k or 3k / 10k

Which would be better, or would you need both?

Norton & Ohishi Waterstones

Any input welcome :-)

Nick