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It was this one
It came pretty quickly.
It definitely requires some practice and technique and I can imagine 90% of the time I'm only going to use the two finest stones.
But when the multitool I use with it has a crisp perfectly shaped edge, where as the one I did myself on a stone has a smooth bevel.
The advantage lots of people tout is the consistency, so once you set your edge you can pretty much achieve it every time.
Have you a link? maybe i'll abandon my whetstone idea.