Columns is a powerful but also a quite complex tool, you need some time to get into it and to understand how to get your vizualisation.
But once you're in, it's incredibly full of possibilities, details, you see that the makers have thought a lot about it.

The support is also excellent and very fast; the requests i had where taken into account, with an update of the app 1 day after :)

Looking forward the next versions ! Thanks :)