If you have been using ID-11 then you will like HC-110 as it produces very similar results. The concentrate keeps for years. Most people dilute the concentrate directly so you will need a small graduate say 10 to 25 ml. I use a dilution of 1+49 and really like the results.
That wasn't what we found when we tested them a few years ago, we found HC-110 gave larger grain and a slight drop in film speed. That's what Kodak indicate as well in there data (and still do).