You and I understand that, however the general public will go out and buy a dryer recept, thinking it is a 50 amp device. I would have stated you used a 50 amp range recept, as that is really the device you're using.
I bought a small one five or six years ago. It did suck. It couldn't hold a single lamp at a steady voltage, we had to put a bigger load on it like a space heater, and then we were on the limits of capacity and kept tripping the breaker on it. (It was a little one, like 600 watts or so.)
unless we run out of CNG on all our multiple backup power stations(too big to really be considered a generator as it runs a small city) but first our private substation would have to failed before the generators would kick on. 
For emergency use and only powering a few essential circuits, wouldn't turning off the main breaker and backfeeding power from the generator into the panel be sufficient? I would also turn off any circuits that weren't essential so someone didn't accidentally overload the generator.
Have you never bought a power tool from HF? I would not trust a HF piece of equipment for anything critical.
I'm OK with portable so long as it will last with proper maintenance. As far as a dedicated line - I'd probably have an electrician come in and put in a transfer switch or something where I can switch off of city power and then switch over to generator provided power. I'd have to kill a lot of circuits to non-essentials but it would be nice to be able to do it in an emergency.
Most modern electronics already use an internal AC->DC converter. Any "dirty" power would be corrected at that point. Clean power would only be a requirement of electric motors or other things that relied on the raw 60hz sine wave for proper operation. I believe that would include your blower motor for a furnace. We have NG Heat, Water, and Fireplace. The FP has a small blower fan but should be able to produce enough heat even without it to keep the house tolerable. My next plan was to start filling empty bottles with hot water to keep my fish tanks at a tolerable temp. Fortunately all our lines are buried and we must not be far from the substation as it's not often we loose power.
For emergency use and only powering a few essential circuits, wouldn't turning off the main breaker and backfeeding power from the generator into the panel be sufficient? I would also turn off any circuits that weren't essential so someone didn't accidentally overload the generator.
Have you never bought a power tool from HF? I would not trust a HF piece of equipment for anything critical.
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