Keeping this short and sweet. First rating on AppSumo, and that in itself says a lot.
My experience in the last hour or so with this app has been as follows:

1- Yet another Kanban app, let's see what's upp!
2- What's with the gamification Shenanigans. Cha-ching! More coins please :)
3- Navigation is a breeze, minimalism at best, like it was designed by a yogi.
4- 2 boards in and I'm hooked. It works on my Android phone too

Count me in as a fan, but you're not off the hook yet if I encounter any hiccups. And don't forget your grassroots when you go big ;)