Thought I'd share this with the PH community. I've been using it for quite sometime and feel it beats other board based managers. What's great is that you can have the simplicity of something like Trello, but still have real stories, sub-tasks, and other agile goodness, not to mention custom workflows. They're also just about done with implementing the @ comment functionality, which will make it even better. While not associated with them in any way, I can surely answer some questions based on my experiences.