Have not used it during a power outage, but it works well. Set up is easy. I would recommend updating the manual. The information on page needs to reflect changes to the battery installation (p.12) and set up.
I was very impressed with the ease of assembly and the quality of the product. I had a competitors product that did not last and could not buy parts. I look forward to get many years of use out of this product. My neighbor came by while I was putting it together...he also felt the same as I do.
I just purchased the unit and assembled , per the instructions. I wanted a dual fuel unit, so having already purchased a tank of propane(for my new gas grill), naturally I wanted to see it run on that fuel type. In addition, I also wanted to see if the wireless remote would work as well. The gas tank hook up was simple, and the remote started the unit better than expected. By that I mean; all you have to do is push the button once, the unit will then keep trying until it starts. It took three attempts initially, but after that, it only took one try.I plugged in a small appliance to the standard 120, and it worked. I hope I never have to use it, but I am confident it will work as advertised, should the need ever arise.