The Honda EU7000is is exceptional. The power output is very clean for my programming computers that are sensitive. I have a transfer switch for the house for 240V input. This generator/inverter easily runs the microwave, refrigerators, HVAC fan (home is natural gas heated and fan is about 400W running). We have LED lights mostly, a few florescent buls and no incandescent bulbs. The lighting is wonderful in the whole house with very little power load. 8500BTU window air condition starts and cycles with no problem, running watts 700W. In econ mode, the Honda idles down to around 2200RPM and under demand, I never saw it go beyond 3400RPM. It handles burst demand without any flickering. The GX390 engine has plenty of power to quickly rev to higher RPM as needed matched to the generator head. The low noise level is amazing. The closed housing of the unit itself is a big part of the noise reduction along with a fantastic muffler.
I changed the oil at 15 hours of break-in in econ mode, mostly 2250RPM. Engine is breaking in nicely and had super-fine metallic break-in in the oil which is normal but less than you'd expect on a new engine. I'll change the oil again after it's 2nd tank of gas and switch to Mobil 1 10W30 synthetic when engine oil shows the engine is through its break-in period.
I highly recommend this inverter/generator because of superb fuel economy with fuel injection on this GX390. I stopped at 15 hours to change break-in oil and it ran another 3 hours to empty. You will not get anywhere near this 5.1 gallon run time on a non-inverter carburetor fueled generator that runs at 3600RPM all the time. Worth the money and it will last for many years with occasional maintenance.