It's only gone mad once.
Daughter was using an electric iron late at night, power went off, inverter screamed with red lights.
Fault 05 = op short or internal overheat. Not sure why it would overheat using 1,600W at night, but lots of extensions used as well so could have been a short. Turned everything off, turned everything on and all working again. Now banned from using the iron after dark, mainly 'cos I don't want to fiddle around in the dark.
Apart from that no problems.
Like @Crossy no need to wire your heavy duty items through the inverter. Both my shower heaters, air-con and a kitchen double socket still on the grid supply.