That's more for major imperfections if you are using it for razors. I set the bevels and take out small to moderate imperfections on a 2K. Granted that is a Shapton pro and a bit faster at removing material than the superstones, but the 1K you have should do really well at that.
I never liked those flattening stones myself, but some people do. Make sure you lap it flat before you use it on your stones, and use it sparingly. Superstones are realatively soft and will eat away quickly if you don't pay attention.
I had a set. They are good stones, but I was doing a lot of razors and found myself lapping them all the time, so I traded them and got some Shapton pro stones. For casual honing though, they should last you a long, long time.