The RSGS units sound like they'd cure a lot of issues plaguing current satellites. DARPA says that correcting "mission-ending mechanical anomalies" that include problems with how their solar arrays and antennas deploy are among those fixes. The system would also deliver new upgrades to antennas currently in space. It'd do so with a robotic arm that the agency is calling "FREND" that will be capable of swapping to whatever tools are needed for the task at hand. Additionally, it'd also be capable of machine vision and delivering "high-fidelity spatial orientation information" that's intrinsic to keeping the DARPA craft in orbit.

"Under the RSGS vision, a DARPA-developed modular toolkit, including hardware and software, would be joined to a privately developed spacecraft to create a commercially owned and operated robotic servicing vehicle (RSV) that could make house calls in space. DARPA would contribute the robotics technology, expertise, and a Government-provided launch. The commercial partner would contribute the satellite to carry the robotic payload, integration of the payload onto it, and the mission operations center and staff. If successful, the joint effort could radically lower the risk and cost of operating in GEO."

DARPA and the government would cover the cost of the launch, but after that it'd be up to the commercial service that needed the help to pick up the tab:

Program manager Gordon Roesler says that this is the sort of thing that both commercial and government have been clamoring for for decades and that the RSGS initiative would address that need. When can we expect this to happen? That isn't clear yet as DARPA is still looking for the necessary commercial partner, but it estimates RSGS should be in place within five years time. For a better idea of what this would all look like, see the infographic below, or the video up above.