"Example: You have maybe a 5000 watt generator. You run your light and frig. Then after you go to bed your freezer and the frig.
Just thinking you would have a lot of flex ability with this over the dedicated circuit deal."
PMFJI again... :-) This was my thinking EXACTLY. I have a 6500 watt generator and have no problem running lights, TV, fridge, freezer, UPS, computers, furnace. Basically everything except the hot water heater. In a crisis situation, I could flip the breakers for the other circuits and bring on the water heater by itself to get hot water.
I initially looked into the standard transfer box arrangement and they seemed like a bit of a nightmare to get installed and then of course you are limited to the circuits you pre-wire.
With the interlock, I flip the main the generator breakers and whaamo, the whole house has electricity.
I have been wanting to get a generator for years and kept putting it off. The compelling event was the big October storm a couple years ago where we were dark for 3+ days. I figured I would install the generator and then never need it again.
Funny thing is I have over 40 hours on the generator in just 2 years. We seem to have lot of 3-4 hour outages on clear blue sky days.
It certainly gives a lot of piece of mind on a cold winter night knowing that if the power goes out I can still keep things warm.