if you own a scope, you can find out yourself when running under different loads....you'd be surprised how your wave will look.
Some electronics are 'forgiving' and handle these impuritys, some don't.
Ditto,
Found out the hard way. Lost a laptop and a printer power supply. I will not trust expensive electronics to these generators ever again. It worked fine for a month, then BAM. Of course it happened at the worst possible time.
Live and Learn...