Been watching James Condon's videos for a while, and, I suppose impulse bought this because it ticked the boxes that I have been thinking about and I was impressed with how it performed. Clean sine wave inverter, good capacity, can run in parallel if needed, and for me, dual fuel (propane and gasoline). No natural gas in my area, so I won't use that.
Admittedly I haven't put it to much work yet, but I have been running it for break-in on both gasoline and propane. It starts on the second or third pull for me. It does auto-switch between the two fuels as described, stumbling slightly but not stalling out. I did notice the red propane light only partially lighting up when I slowly cracked the propane valve, but when I shut it off, paused, and then opened it quickly, the red light lit up bright. I did the first oil change after 1-1/2 hours of running, and there was some fine glitter in the oil, but nothing that concerns me yet. I'm running 15W-40 in it.
Overall, it seems like a good unit, but there are a couple of things worth mentioning. For one, the sticker on the side says 450mL oil, the manual says 0.6L of oil, and I ended up adding 650mL to get halfway up the dipstick. 450mL barely wet the tip of the dipstick. Also, the Phillips-head gas bowl drain screw is blocked by the side support bar. It looks like it'll be tricky to drain the bowl. Update: Not really tricky, but use a flatblade instead, Phillips didn't catch very well. Draining the bowl does get a few teaspoons of gas out.
But the unit runs very smooth, is not noisy (I wouldn't say it's quiet, but it's not annoying), it holds voltage and frequency well (~122V at 59.97Hz is what I was seeing with 1000W of load), and the wheeled dolly addition makes it easy to move around. I'm pleased with it so far. I'm feeding it non-ethanol gasoline but am going to invest in a couple more containers of propane for longer term storage. This will be an emergency generator for me. Here in Texas we need all the backup power we can get.