Kind of didn't work. I signed up, and i was trying to set something up on my staging to scale it out if a dyno was idle, but it didn't appear to work. I had it at zero dynos, so you'd expect it to scale up immediately.
Also, not great UI design. I kept wanting to manage my monitors, but to do so, I had to hit Status, and then hit Manage Monitors. I'd rather have had it on the sidebar, like Add Monitor was.