New Post: Composite C1 5.1 available

We are currently working on a project were we are going to need a selector which takes item from a hierarichical list.
We were delighted when we saw the release notes from Composite C1 5.1 where a Hierarchical Selector Widget is implemented, but to be honest the information about this new widget is so scarce it keeps us wondering even more.

Could someone be so kind to explain this in a more profound way.