I think all project management SaaS have let me down so far, Pivotal I think is much superior, the issue is that all of them are around tasks and timelines, a project is so much more than that. If I need to put my documentation elsewhere, and track bugs elsewhere, this is just an overhead (pivotal as example, I stopped using it for bug tracking and moved to Jira)
As a feedback, I would at least change the bootstrap default colors, it's starting to look like all startups look the same...
And in my 5 seconds attention, I didn't quite get the main basecamp killer feature, but I liked the notion of the trees. you got my email...
By the way, would be happy to hear your thoughts on http://flashissue.com if you send newsletters and think it's too painful and takes too long