The EG4 system is quite robust. Initial R&D testing indicates that this could be a comparable replacement to the now discontinued Schneider XW platform (which was, without a doubt, the best and most robust off-grid solution available, but cost a fortune).
Findings so far are almost zero transfer time from grid to battery. Fired up a 2HP motor with 5kW heater effortlessly. Commissioning wasn't hard, but it's more complicated than your typical "home battery".
I still have a bunch of tests to run including generator support, the monitoring portal, smart loads, etc.