https://www.championpowerequipment.com/product/200994-4650-w...
I did the inlet and cutover switch install myself as well. I've got dual sub-panels but the circuits I wanted to power were all in my basement, so I've got it wired up for my kitchen fridge, a basement chest freezer, basement sump pump, and a few light and electrical outlet circuits. I can't run my normal HVAC, but I can run a portable HVAC I purchased that's sufficient for my basement in a pinch.
I was in Miami for Hurricane Andrew and have some fun stories about generators, extension cords, and siphoning gasoline out of our cars.
Meanwhile my uncle on Long Island is having a whole-house generator installed this summer, including burying a propane tank. I think he's spending something like $15K on that.
--- That actually doubles your risk of failure, better to go with one big one.
If I had a bigger unit (Honda also makes a 3000 watt and 6500 watt model), or just had two of these in parallel, it would be worth consideration.
Re: transfer switch, again if I had a bigger unit I'd consider it, but I can run so few loads it didn't seem worthwhile. This is basically to keep food from spoiling, internet/TV going, and fans so we can sleep somewhat comfortably.