My company is evaluating Open Project, among other solutions. We're outgrowing our current system, and also beginning to suspect the developers aren't interested in moving it forward, or even properly maintaining it. We like that Open Project is open source. We think building as much as possible on open source will, in the long term, be a win. We also have a lot of Ruby knowledge in house, so we could contribute to it ourselves.
What has everybody's experience been?