This looks really slick - I like it a lot!

However, from my brief look, there are two things that would prevent me from moving from trello:

1. The in-task checklists that trello has

2. I use the trello app on my phone a lot while I commute. I especially like the "quick add card" feature. I don't think I can switch to another tool until it has a decent (Android) app... (maybe this has one and I overlooked, but I wouldn't expect a brand new web app to also have mobile apps)