I have a 3.5kva kipor and it is an excellent machine.
Starts easy, runs quietly, does not run at high rpm unless heavily loaded. The rpm and load run in unison. Increase in load increases rpm.
Lighting from this unit does not flicker at all. Great for computers.

Downside to a great product: paint falls off readily and rust forms quickly on the metal parts of the casing.

I can not get satisfactory answers on the 6 kva unit . Does it work the same way as the 3.5 kva? Kipor agent in australia does not answer email
Reliable and quiet and no flicker ing lighting
Metal casing rusts rapidly