Using a modified sine wave inverter on a Frigidaire?

I put the same fridge in my previous coach, 18 cu.ft. Frigidaire from Lowes. I called Frigidaire (Electrolux) tech support and was told they recommended pure sine wave to ensure longer component life.

Would it have really made a difference? Not sure. However, considering what I paid for the Norcold to residential swap, I decided not to take the risk. I replaced my old MSW inverter with a Magnum Energy PSW unit.

I will say I immediately noticed that the fridge ran quieter when I made the switch.