There are good MSW inverter but those are not cheap. There are terrible PSW inverters, some of those are not cheap.
A PowerBright CW150 MSW inverter made my satellite receiver run hotter than usual and the TV had lines.
For a season we used a relatively inexpensive PowerJack PSW inverter that handled the TV, Sat. microwave, coffee maker great. When we put a real load, our little air conditioner on it, it became a $200 paper weight.
Now we use a Tripp-lite 1250fc industrial MSW inverter.($200) It handles everything including the A/C with ease. The TV is clean, the receiver is cool and the A/C runs so smooth that you have to check the killawatt to know if the compressor is on.
What I am saying is buy what you need due to research not the almighty dollar or by buzz words tossed around by chicken littles. Quality MSW has been around for a long time, they just are not cheap.