From the link
BOLIY Pro3600SI (model number matches engine kw output not ac output) is a true Digital Signal Processing
(DSP) inverter generator. Similar models including Honda, Yamaha, Robin Subaru, & Kipor use transistor
induced technology which is just simulated signal processing. With the advanced German made
microprocessor, the DSP processor results in a power conversion rate of up to 22% higher than comparable
inverter generators from Honda, Yamaha, Kipor & Robin. The voltage is adjusted to maintain at stable 120V by
the computer inverter module. The light weight design makes them ideal for transportation without the need
for cumbersome wheel kits and extending handles
I'd be interested to hear opinions about the 22% higher efficiency ...