One of my employees wanted to plug his Apple laptop into my MSW inverter. I told him not to as I'd heard it might damage it. He said he really needed to use it and would just take the chance. It immediately fried his laptop. He had to buy a new one.
A customer of mine with an off grid cabin was using a MSW inverter to power the cabin. They plugged in 2 brand new gas ranges before they realized they weren't defective, the MSW inverter was destroying them.
So yes, MSW can and will destroy some things. They can also make motors run hotter which can shorten their life. However, I have used MSW inverters for years to run things like lights and corded power tools with no problems.
