I stumbled on to a 2nd-hand soft Arkansas a couple of weeks ago, and planned to use that in the shop for my chisels and planes. Did a wee bit of research into Arkansas stones, and started looking into getting a hard Arkie to go along with it. Thanks to your link, I've got that on order now.
There are grades beyond the hard (black and translucent) that I understand will give a finer finish, but for the tools I'll be using them on, they're a bit too spendy. I have zero experience using them on razors, so hopefully others will chip in on that front.