I do agree, not all inverters are created equal.. I am a ham radio operator.. now what this means is I occasionally chat with other hams via radio,, Our radios are always under 1,000 watts average and most are closer to 100 (Compart this to your local AM or FM broadcast station) We chat rather long distance. I'm in Southern GA (Townsend) and the last person I talked to in Kentucky.. ANd that was just today.. Cranking the power DOWN I have gone digital (30-40 watts) and talked to Italy, Spain, France, Germany, Cuba, and more.. This means a very senistive radio receiver.. So what does this have to do with inverters?
MSW inverters generate a LOT of radio frequency interference.. LOTS of it.
This is why I have a Prosine 2.0 (Xantrex, True Sine Wave) So far I have had exactly one piece of hardware that was not happy with it,, A coffee pot.. The very same coffee pot (modified) that brewed my morning up of brew, The clock timer is no more, but it still makes great coffee, just with a manual switch.