I love this
I started off with Nifty which I loved but had to switch to Beesbusy because of Nifty's poor Gantt features for timeline planning.
Beesbusy is great but when you do project brainstorming, it's hard because subtasks are limited.
In comes Subtask. The drag and drop interface is a breeze to use. You start off with creating your tasks lists on your project board, then you can plan them out on the timeline using the timeline view just by dragging and dropping each task on to your timeline.
Then you assign people or roles to your task using the assignments view. Super easy.
My only disappointment is that it does not allow you to create project templates to reuse project boards by changing the start or end date and have all your dates recalculate. Asana, Beesbusy and Nifty all do this. You're giving up an important feature when you make the switch.
I hope they add this to their roadmap. That would make it near perfect!