So, after ordering the Gripmaster Jumbuck grips to try leather grips, I now ordered some of the Gripmaster Roo grips for the irons. Put the Jumbuck on my woods, hybrids and wedges and the Roo ones on my irons. Haven't hit the irons yet but just from holding them I can make the following comparison.
Jumbuck are definitely softer than the Roo but they do not feel torquey. The Roo grips are definitely firm feeling but not in a bad way. Actually that was the idea to have something on the firmer side for my irons. The Roo grips are a bit more difficult to install for some reason. They don't slide as well on the shaft. As for tackiness, I would say they are similar. When you first grip both grips you get the feeling that the Jumbuck grips are tackier than the roo grips. But I think this is just because the Jumbucks are softer feeling and that gives the impression that it is tackier. Overall I am very happy with the grips and like them s lot so far. Let's see how they go on a long term.