Any AMS is as useful as you want it to be. If correctly configured, attaching a new client to BAM or GR is enough to have all your projects that you told the AMS you want to add to new clients to be attached.

Once you are attached to an AMS, there's no escape and with GR I found it was fetching more data than I wanted them to fetch, so I detached the clients again. Whilst, when I looked in just now, they're still grabbing my data. Since I've obfuscated the device names (the network names) with a setting in the cc_config.xml, they can only get project totals and list all devices with zero score, still, as fetched directly from the projects. Anyway, I have removed the projects in the account now too, and still they're listing my decommissioned devices by name. No option to delete or remove.

PS: there is a Refresh button bottom center of the account home page that should fetch the account totals directly from the projects. I just for the test added a project back, hit the button and it fetched the correct totals.

PPS: I just found that malaria.control.net is not supported by them... BAM does. Not checked what else is missing there.