I have a 2.2 kW Honda that does have an inverter, is absurdly quiet, and sips fuel. I also have an extended fuel tank for it so it can run overnight. All of that, plus adequately sized extension cords, was somewhere around $2500. It's also still a pain in the ass to set up when it's necessary, but at least I get to run fridges, freezers, LAN, TV, fans, etc. I also have to do monthly load tests, source ethanol-free gas, rotate gas supplies, and practice running extension cords to everything so I'm not confused in the dark. Lest you think all of this is unnecessary prepper beliefs, I live in Texas (for now - about to move), and it has been required far more often than I'd like.
A standby generator that can run an entire house will run you $15-20K with installation, and that assumes you have natural gas plumbed to your house already. If you don't, you'll have to bury a LPG tank, or have an unsightly blob in your yard.
This feature of the Lightning is the major draw for me, and I am seriously considering it once they've proven themselves for a few years.