Assume they have a back up battery on the pump. 
Fine, as long as there’s electricity to keep the pumping the schidtt uphill. The system can be a bit finicky I guess.
We went to see them, and since it was an hour and half away we decided to stay the night so the kids could visit, etc. It seems that having 8 people in the house instead of 4 required changing some settings since they kept getting some kind of holding tank warning.
Some other friends bought a house with a septic system. They needed to have it serviced and were told that the system had aged out and needed replacement, but that company wouldn’t work on the system since a concrete driveway had been poured between the tank and drain field.
Just two of many reasons I won’t buy a house that’s not connected to a sewer system.
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Where I live in the Hampton Roads area of Virginia, we also have several of these companies and in my experience they are “Bottom Feeders”… They go on a walk thru of your home (no inspection required…) and they find every little thing and blow it up to some huge repair…
My subdivision has about 500-homes in it and they generally are assessed at $400,000 up to $1,000,000 and they almost all sell for at least 5% more than the assessed value.
Over the last couple of years, several elderly couples, or the surviving spouse, decided to take advantage of these quick sales to downsize their homes. Not one of them was offered more than 60% of the assessed value. All declined the low-ball offers…
Ultimately, they sold their homes “As Is…” Two of them received upwards of 90% of the assessed value and a bidding war brought the third one up to the assessed value.