Task management is one of the important aspects in project management. Being a team lead myself, I know how difficult it is to manage your team's progress without using any management software.
I've used other project management web apps and one close to this is Trello.
I checked the website and I'm not impressed by its presentation in mobile. I also don't see why people would choose this over other available products given that it still requires you to give your email to gain an early access.