OK, lets get this right. No generator is modified sine wave. All generators are true sine wave. The main advantage of inverter-style generators is lower weight, lower noise and better fuel efficiency. Their electrical waveform is not significantly cleaner than any quality non-inverter generator. Ordinary non-inverter generators like Onan and Generac have been powering sensitive electronic equipment in hospitals, military installation and air traffic control centers for the last half century. My 20Kw Generac powers my whole house during power failures.