I integrated this into my client's application when it was still in beta. Even in beta I was happy with it, and now it is far more robust.
It has allowed us to track down edge case bugs with nearly no back-and-forth communication with the client.
Most importantly, it has let us reach a level of proactive development for our clients' live applications that gives them the peace of mind that their applications are monitored and being fixed without needed to request it.