They work and work very well!!
I originally bought an AC70 due to power outages in my apartment building. This was to keep the fridge running. It worked so well I bought a AC60 with a B80 expansion battery and then an AC180. This past couple of weeks with the hot temps I needed all of them due to power loss in building (old building). I managed to keep my fridges working, my computer system running and my tv. Plus one AC unit running. They are quiet when running even under load. So impressed with the performance I just purchased an Elite 100V2 plus another B80 just for peace of mind.