Narrandum isn't like the other tools in this field at all. It's definitely a little weird. But it's cool that they're trying something different.
Even though it's still in beta, I found it really fast and slick to use. There's lots of help available to explain the concepts, and I was able to make a simple customer journey in no time.
I'm looking forward to seeing how this service develops. There are still one or two rough edges, but already it's pretty useful. And free!