Surge will differ in a lot of ways. #1 is its time series. RTL/TH are point in time right now. So instead of seeing what your peers are doing right now, you'll be able to be see what they were doing for the last week+. Additionally we're bringing a lot of the Observability practices that exist in the standard tech space into Lightning. Like Alerts, Security, Analysis, etc.
We're about to start opening it up to select beta testers in September and expanding from there.
It will have an agent that will be OSS and will be able to be run locally. The Surge service itself will be hosted for us by now, but eventually will probably be able to run the whole stack locally.